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Classic game replay

Garry Kasparov vs Miguel Illescas Cordoba, 1994

This replay preserves the complete 85-ply score of Kasparov playing White across 43 numbered moves. The board can be advanced one ply at a time; the notes stick to observable board changes rather than guessing at the players’ intentions.

On this page
  1. Practice positions
  2. Replay with move-by-move board facts
  3. PGN
  4. Sources and checking
  5. Continue with another game
White
Garry Kasparov
Black
Miguel Illescas Cordoba
Event
Linares
Year
1994
Result
1-0
Opening
D34 Tarrasch Defense: Classical Variation, Main Line

Opening reference: Tarrasch Defense: Classical Variation, Main Line (D34).

In this game, 20 half-moves are labelled opening, 38 middlegame and 27 endgame. The score contains 20 captures and 3 checks or mates; before a recorded move, the position offered a median of 32 legal choices. The source score ends after 43.Rxh6 with the recorded result 1-0. Its termination tag was not retained, so this record does not infer whether the game ended by resignation, time or another cause.

Practice positions

The daily trainer uses a short set of positions from this complete score. Each link goes to the exact half-move rather than only the numbered move.

  1. 10.Nxd4 — Recapture on d410.Nxd4 was a leading choice in the fixed engine check.
  2. 20.a3 — Advance the a-pawn20.a3 was a leading choice in the fixed engine check.
  3. 24.Rc5 — Rook on the semi-open c-file24.Rc5 was a leading choice in the fixed engine check.
  4. 30.Rxc8+ — Recapture on c830.Rxc8+ was a leading choice in the fixed engine check.
  5. 36.Be4+ — A forcing check36.Be4+ was a leading choice in the fixed engine check.

Replay with move-by-move board facts

The board, fact panel and transcript use the same legal score. “Fixed engine check” means Stockfish 17.1, one thread, a fixed 25,000-node search and 3 candidate lines. It compares moves under one reproducible setting; it does not claim to reconstruct a player’s thoughts.

♜♞♝♛♚♝♞♜♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♜♞♝♛♚♝♞♜
Garry Kasparov vs Miguel Illescas Cordoba, 1994

Start position

Use Previous and Next on the board, or select a move in the transcript. The board fact and fixed engine check remain visible until you choose another move.

Opening · 1.c4 to 10...h6

  1. 1.c4 Advance the c-pawn

    Board fact: White moves the pawn from c2 to c4; from there it controls d5.

    Fixed engine check: Near the leading choice · c4.

  2. 1...Nf6 Develop the knight

    Board fact: Black develops the knight from g8 to f6; from there it controls d5 and e4.

    Fixed engine check: Ranked first · Nf6 d4.

  3. 2.Nc3 Develop the knight

    Board fact: White develops the knight from b1 to c3; from there it controls d5 and e4.

    Fixed engine check: Ranked first · Nc3 e5 Nf3 Nc6.

  4. 2...c5 Advance the c-pawn

    Board fact: Black moves the pawn from c7 to c5; from there it controls d4.

    Fixed engine check: Near the leading choice · c5 Nf3 g6 e4.

  5. 3.g3 Advance the g-pawn

    Board fact: White moves the pawn from g2 to g3; from there it controls f4.

    Fixed engine check: Ranked first · g3 g6 Bg2 Bg7.

  6. 3...e6 Advance the e-pawn

    Board fact: Black moves the pawn from e7 to e6; from there it controls d5 and f5.

    Fixed engine check: Ranked first · e6 Nf3.

  7. 4.Nf3 Develop the knight

    Board fact: White develops the knight from g1 to f3; from there it controls d4 and e5.

    Fixed engine check: Ranked first · Nf3 d5 cxd5 Nxd5.

  8. 4...Nc6 Develop the knight

    Board fact: Black develops the knight from b8 to c6; from there it controls d4 and e5.

    Fixed engine check: Ranked first · Nc6 Bg2 d5 cxd5.

  9. 5.Bg2 Develop the bishop

    Board fact: White develops the bishop from f1 to g2; from there it controls f3.

    Fixed engine check: Ranked first · Bg2 d5 cxd5 exd5.

  10. 5...d5 Change the pawn structure

    Board fact: Black moves the pawn from d7 to d5; the move changes the central pawn contact; from d5 it attacks White's pawn on c4.

    Fixed engine check: Ranked first · d5 cxd5.

  11. 6.cxd5 Exchange on d5

    Board fact: White's pawn takes the pawn on d5; the move changes the central pawn contact; White accepts doubled pawns on the d-file; from d5 it attacks Black's knight on c6 and Black's pawn on e6; white is ahead by 1 conventional material point after the capture.

    Fixed engine check: Ranked first · cxd5 exd5 d4 h6.

  12. 6...exd5 Recapture on d5

    Board fact: Black's pawn recaptures the pawn on d5; the move changes the central pawn contact; material is level after the capture.

    Fixed engine check: Ranked first · exd5 d4 cxd4 Nxd4.

  13. 7.d4 Change the pawn structure

    Board fact: White moves the pawn from d2 to d4; the move changes the central pawn contact; from d4 it attacks Black's pawn on c5.

    Fixed engine check: Ranked first · d4 Be7 O-O h6.

  14. 7...Be7 Develop the bishop

    Board fact: Black develops the bishop from f8 to e7; from there it controls c5, d6 and f6.

    Fixed engine check: Ranked first · Be7 dxc5 Bxc5 O-O.

  15. 8.O-O Kingside castling

    Board fact: White castles kingside, moving the king to g1 and the rook to f1. The move changes king safety and develops the rook in one turn.

    Fixed engine check: Ranked first · O-O h6 dxc5 Bxc5.

  16. 8...O-O Kingside castling

    Board fact: Black castles kingside, moving the king to g8 and the rook to f8. The move changes king safety and develops the rook in one turn.

    Fixed engine check: Ranked first · O-O dxc5.

  17. 9.Bg5 Develop the bishop

    Board fact: White develops the bishop from c1 to g5; from g5 it attacks Black's knight on f6.

    Fixed engine check: Ranked first · Bg5 c4 Ne1 Be6.

  18. 9...cxd4 Exchange on d4

    Board fact: Black's pawn takes the pawn on d4; the move changes the central pawn contact; Black accepts doubled pawns on the d-file; from d4 it attacks White's knight on c3; black is ahead by 1 conventional material point after the capture.

    Fixed engine check: Ranked first · cxd4.

  19. 10.Nxd4 Recapture on d4

    Board fact: White's knight recaptures the pawn on d4; from d4 it attacks Black's knight on c6; material is level after the capture.

    Fixed engine check: Ranked first · Nxd4 h6.

  20. 10...h6 Create pressure on g5

    Board fact: Black moves the pawn from h7 to h6; from h6 it attacks White's bishop on g5.

    Fixed engine check: Ranked first · h6 Be3 Re8 Qc2.

Middlegame · 11.Be3 to 29...Rxc8

  1. 11.Be3 Create pressure on h6

    Board fact: White moves the bishop from g5 to e3; from e3 it attacks Black's pawn on h6.

    Fixed engine check: Ranked first · Be3 Re8 h3 a6.

  2. 11...Re8 Rook on the semi-open e-file

    Board fact: Black moves the rook from f8 to e8; the rook now works on a semi-open e-file; from e8 it reinforces the queen on d8.

    Fixed engine check: Ranked first · Re8 Rc1.

  3. 12.Rc1 Rook on the open c-file

    Board fact: White moves the rook from a1 to c1; the rook now occupies the open c-file; from there it controls c3.

    Fixed engine check: Ranked first · Rc1 Bf8 Qc2 Bg4.

  4. 12...Bf8 Reposition the bishop

    Board fact: Black moves the bishop from e7 to f8; from there it controls c5 and d6.

    Fixed engine check: Ranked first · Bf8 Qc2 Bd7 Rfd1.

  5. 13.Nxc6 Exchange on c6

    Board fact: White's knight takes the knight on c6; from c6 it attacks Black's queen on d8 and Black's pawn on a7; white is ahead by 3 conventional material points after the capture.

    Fixed engine check: Near the leading choice · Nxc6 bxc6.

  6. 13...bxc6 Recapture on c6

    Board fact: Black's pawn recaptures the knight on c6; the move changes the central pawn contact; from c6 it reinforces the pawn on d5; material is level after the capture.

    Fixed engine check: Ranked first · bxc6 Na4.

  7. 14.Na4 Reroute the knight

    Board fact: White moves the knight from c3 to a4; from there it controls c3 and c5.

    Fixed engine check: Ranked first · Na4 Qc7 a3 Ne4.

  8. 14...Bd7 Develop the bishop

    Board fact: Black develops the bishop from c8 to d7; from there it controls c6, e6 and f5.

    Fixed engine check: Ranked first · Bd7 Bc5 Bxc5 Nxc5.

  9. 15.Bc5 Create pressure on f8

    Board fact: White moves the bishop from e3 to c5; from c5 it attacks Black's bishop on f8 and Black's pawn on a7.

    Fixed engine check: Ranked first · Bc5 Bxc5 Nxc5 h5.

  10. 15...Bxc5 Exchange on c5

    Board fact: Black's bishop takes the bishop on c5; from c5 it attacks White's pawn on f2; black is ahead by 3 conventional material points after the capture.

    Fixed engine check: Ranked first · Bxc5 Nxc5 Bg4 Re1.

  11. 16.Nxc5 Recapture on c5

    Board fact: White's knight recaptures the bishop on c5; from c5 it attacks Black's bishop on d7; material is level after the capture.

    Fixed engine check: Ranked first · Nxc5 Bg4 Re1 Nd7.

  12. 16...Bg4 Create pressure on e2

    Board fact: Black moves the bishop from d7 to g4; from g4 it attacks White's pawn on e2.

    Fixed engine check: Ranked first · Bg4 Re1 Qa5 Qc2.

  13. 17.Re1 Improve the rook

    Board fact: White moves the rook from f1 to e1; from e1 it reinforces the queen on d1.

    Fixed engine check: Ranked first · Re1 Qa5 h3 Bh5.

  14. 17...Qa5 Create pressure on e1

    Board fact: Black moves the queen from d8 to a5; from a5 it attacks White's rook on e1 and White's knight on c5.

    Fixed engine check: Ranked first · Qa5 h3.

  15. 18.h3 Create pressure on g4

    Board fact: White moves the pawn from h2 to h3; from h3 it attacks Black's bishop on g4.

    Fixed engine check: Ranked first · h3 Bh5.

  16. 18...Bf5 Create pressure on h3

    Board fact: Black moves the bishop from g4 to f5; from f5 it attacks White's pawn on h3.

    Fixed engine check: Ranked first · Bf5 Qd4.

  17. 19.Qd4 Create pressure on f6

    Board fact: White moves the queen from d1 to d4; from d4 it attacks Black's knight on f6 and Black's pawn on d5.

    Fixed engine check: Ranked first · Qd4 Rab8 a3 Nd7.

  18. 19...Rab8 Rook on the semi-open b-file

    Board fact: Black moves the rook from a8 to b8; the rook now works on a semi-open b-file; from b8 it attacks White's pawn on b2.

    Fixed engine check: Ranked first · Rab8 a3.

  19. 20.a3 Advance the a-pawn

    Board fact: White moves the pawn from a2 to a3.

    Fixed engine check: Ranked first · a3 Qb6 b3 Nd7.

  20. 20...Qb5 Create pressure on c5

    Board fact: Black moves the queen from a5 to b5; from b5 it attacks White's knight on c5 and White's pawn on b2.

    Fixed engine check: Ranked first · Qb5 b3 Qa5 e3.

  21. 21.b3 Advance the b-pawn

    Board fact: White moves the pawn from b2 to b3; from there it controls c4.

    Fixed engine check: Ranked first · b3 Qa5 e3 Qxa3.

  22. 21...Ne4 Create pressure on c5

    Board fact: Black moves the knight from f6 to e4; from e4 it attacks White's knight on c5 and White's pawn on f2.

    Fixed engine check: Ranked first · Ne4 Nxe4.

  23. 22.b4 Advance the b-pawn

    Board fact: White moves the pawn from b3 to b4; from there it controls c5.

    Fixed engine check: Ranked first · b4 Nxc5 Rxc5 Qa6.

  24. 22...a5 Create pressure on b4

    Board fact: Black moves the pawn from a7 to a5; from a5 it attacks White's pawn on b4.

    Fixed engine check: Ranked first · a5 Nxe4 Bxe4 Rc5.

  25. 23.Nxe4 Exchange on e4

    Board fact: White's knight takes the knight on e4; from e4 it reinforces the pawn on f2; white is ahead by 3 conventional material points after the capture.

    Fixed engine check: Ranked first · Nxe4 Bxe4 Rc5 Qb6.

  26. 23...Bxe4 Recapture on e4

    Board fact: Black's bishop recaptures the knight on e4; from e4 it attacks White's bishop on g2; material is level after the capture.

    Fixed engine check: Ranked first · Bxe4 Rc5.

  27. 24.Rc5 Rook on the semi-open c-file

    Board fact: White moves the rook from c1 to c5; the rook now works on a semi-open c-file; from c5 it attacks Black's queen on b5 and Black's pawn on c6.

    Fixed engine check: Ranked first · Rc5 Qb6.

  28. 24...Qb6 Create pressure on c5

    Board fact: Black moves the queen from b5 to b6; from b6 it attacks White's rook on c5 and White's pawn on b4.

    Fixed engine check: Ranked first · Qb6 bxa5 Qa7 Bxe4.

  29. 25.bxa5 Exchange on a5

    Board fact: White's pawn takes the pawn on a5; the pawn is now passed; the move changes the central pawn contact; White accepts doubled pawns on the a-file; from a5 it attacks Black's queen on b6; white is ahead by 1 conventional material point after the capture.

    Fixed engine check: Ranked first · bxa5 Qa7 Bxe4 Rxe4.

  30. 25...Qb2 Create pressure on d4

    Board fact: Black moves the queen from b6 to b2; from b2 it attacks White's queen on d4 and White's pawn on a3.

    Fixed engine check: Ranked first · Qb2 Qxb2.

  31. 26.Qxb2 Exchange on b2

    Board fact: White's queen takes the queen on b2; from b2 it attacks Black's rook on b8 and Black's pawn on g7; white is ahead by 10 conventional material points after the capture.

    Fixed engine check: Ranked first · Qxb2 Rxb2 f3 Bf5.

  32. 26...Rxb2 Recapture on b2

    Board fact: Black's rook recaptures the queen on b2; the rook now occupies the open b-file; from b2 it attacks White's pawn on e2; white is ahead by 1 conventional material point after the capture.

    Fixed engine check: Ranked first · Rxb2 f3 Bc2 Rxc6.

  33. 27.Rxc6 Exchange on c6

    Board fact: White's rook takes the pawn on c6; the rook now occupies the open c-file; from c6 it attacks Black's pawn on h6; white is ahead by 2 conventional material points after the capture.

    Fixed engine check: Playable; f3 ranked higher · Rxc6 Bxg2 Kxg2 Ra2.

  34. 27...Ra2 Rook on the semi-open a-file

    Board fact: Black moves the rook from b2 to a2; the rook now works on a semi-open a-file; from a2 it attacks White's pawn on a3 and White's pawn on e2.

    Fixed engine check: Near the leading choice · Ra2 Bf1 Rxa3 a6.

  35. 28.Rec1 Rook on the open c-file

    Board fact: White moves the rook from e1 to c1; the rook now occupies the open c-file; from there it controls c3, c4 and c5.

    Fixed engine check: Ranked first · Rec1 Rxa3 Rc8 Rxc8.

  36. 28...Rxa3 Exchange on a3

    Board fact: Black's rook takes the pawn on a3; the rook now works on a semi-open a-file; from a3 it attacks White's pawn on a5 and White's pawn on g3; white is ahead by 1 conventional material point after the capture.

    Fixed engine check: Ranked first · Rxa3 Rc8 Rxc8 Rxc8+.

  37. 29.Rc8 Rook on the open c-file

    Board fact: White moves the rook from c6 to c8; the rook now occupies the open c-file; from c8 it attacks Black's rook on e8.

    Fixed engine check: Ranked first · Rc8 Kf8 Rxe8+ Kxe8.

  38. 29...Rxc8 Exchange on c8

    Board fact: Black's rook takes the rook on c8; the rook now occupies the open c-file; from c8 it attacks White's rook on c1; black is ahead by 4 conventional material points after the capture.

    Fixed engine check: Near the leading choice · Rxc8 Rxc8+.

Endgame · 30.Rxc8+ to 43.Rxh6

  1. 30.Rxc8+ Recapture on c8

    Board fact: White's rook recaptures the rook on c8; the move checks Black's king; the rook now occupies the open c-file; white is ahead by 1 conventional material point after the capture.

    Fixed engine check: Ranked first · Rxc8+ Kh7 Rc5 Ra1+.

  2. 30...Kh7 Answering the check

    Board fact: Black answers the check by moving the king from g8 to h7; from h7 it reinforces the pawn on g7.

    Fixed engine check: Ranked first · Kh7 Rc5 Ra1+ Kh2.

  3. 31.f3 Create pressure on e4

    Board fact: White moves the pawn from f2 to f3; from f3 it attacks Black's bishop on e4.

    Fixed engine check: Near the leading choice · f3 Bg6 Rc5 d4.

  4. 31...Bf5 Create pressure on c8

    Board fact: Black moves the bishop from e4 to f5; from f5 it attacks White's rook on c8 and White's pawn on h3.

    Fixed engine check: Ranked first · Bf5 Rc5.

  5. 32.Rc5 Rook on the open c-file

    Board fact: White moves the rook from c8 to c5; the rook now occupies the open c-file; from c5 it attacks Black's pawn on d5.

    Fixed engine check: Ranked first · Rc5 Be6 Kf2 g5.

  6. 32...Be6 Create pressure on h3

    Board fact: Black moves the bishop from f5 to e6; from e6 it attacks White's pawn on h3.

    Fixed engine check: Ranked first · Be6 Kf2 g5 f4.

  7. 33.Kf2 Activate the king

    Board fact: White moves the king from g1 to f2; from there it controls e3 and f3.

    Fixed engine check: Ranked first · Kf2 g5 f4 gxf4.

  8. 33...g5 Advance the g-pawn

    Board fact: Black moves the pawn from g7 to g5; from there it controls f4.

    Fixed engine check: Ranked first · g5 f4 gxf4 gxf4.

  9. 34.f4 Change the pawn structure

    Board fact: White moves the pawn from f3 to f4; the move changes the central pawn contact; from f4 it attacks Black's pawn on g5.

    Fixed engine check: Ranked first · f4.

  10. 34...gxf4 Exchange on f4

    Board fact: Black's pawn takes the pawn on f4; the move changes the central pawn contact; Black accepts doubled pawns on the f-file; from f4 it attacks White's pawn on g3; material is level after the capture.

    Fixed engine check: Ranked first · gxf4 gxf4 Kg6 Bxd5.

  11. 35.gxf4 Recapture on f4

    Board fact: White's pawn recaptures the pawn on f4; the move changes the central pawn contact; white is ahead by 1 conventional material point after the capture.

    Fixed engine check: Ranked first · gxf4 Kg6 Bf3 Ra4.

  12. 35...d4 Claim central space

    Board fact: Black moves the pawn from d5 to d4; from there it controls c3 and e3.

    Fixed engine check: Recorded move; Kg6 ranked higher · d4 Be4+.

  13. 36.Be4+ A forcing check

    Board fact: White moves the bishop from g2 to e4; the move checks Black's king; from there it controls d5, c6 and d3.

    Fixed engine check: Ranked first · Be4+ Kg7 h4 f5.

  14. 36...Kg7 Answering the check

    Board fact: Black answers the check by moving the king from h7 to g7; from there it controls f6.

    Fixed engine check: Ranked first · Kg7 f5.

  15. 37.f5 Create pressure on e6

    Board fact: White moves the pawn from f4 to f5; from f5 it attacks Black's bishop on e6.

    Fixed engine check: Ranked first · f5 Bd7 Bd3 Kf6.

  16. 37...Ba2 Reposition the bishop

    Board fact: Black moves the bishop from e6 to a2; from there it controls d5, c4 and e6.

    Fixed engine check: Ranked first · Ba2 Bd3 Kf6 a6.

  17. 38.Bd3 Reposition the bishop

    Board fact: White moves the bishop from e4 to d3; from there it controls e4, c4 and f5.

    Fixed engine check: Ranked first · Bd3 Kf6 a6 Kg5.

  18. 38...Kf6 Create pressure on f5

    Board fact: Black moves the king from g7 to f6; from f6 it attacks White's pawn on f5.

    Fixed engine check: Ranked first · Kf6 h4 Ke7 a6.

  19. 39.a6 Advance a passed pawn

    Board fact: White moves the pawn from a5 to a6; the pawn is now passed.

    Fixed engine check: Ranked first · a6 h5 h4 Ke7.

  20. 39...Ke7 Activate the king

    Board fact: Black moves the king from f6 to e7; from there it controls d6, e6 and f6.

    Fixed engine check: Near the leading choice · Ke7 Rc6 f6 Rc7+.

  21. 40.Rc6 Rook on the open c-file

    Board fact: White moves the rook from c5 to c6; the rook now occupies the open c-file; from c6 it attacks Black's pawn on h6.

    Fixed engine check: Ranked first · Rc6 f6 Rc7+ Kd6.

  22. 40...f6 Advance the f-pawn

    Board fact: Black moves the pawn from f7 to f6; from there it controls e5.

    Fixed engine check: Ranked first · f6 Rc7+.

  23. 41.Rc7+ A forcing check

    Board fact: White moves the rook from c6 to c7; the move checks Black's king; the rook now occupies the open c-file; from there it controls c3, c4 and c5.

    Fixed engine check: Ranked first · Rc7+ Kd6 Rh7 Ke5.

  24. 41...Kd6 Answering the check

    Board fact: Black answers the check by moving the king from e7 to d6; from d6 it attacks White's rook on c7.

    Fixed engine check: Ranked first · Kd6 Rh7 Ke5 Rxh6.

  25. 42.Rh7 Rook reaches the seventh rank

    Board fact: White moves the rook from c7 to h7; the rook has reached the opponent’s second rank; from h7 it attacks Black's pawn on h6.

    Fixed engine check: Ranked first · Rh7 Bd5 Rxh6 Ke5.

  26. 42...Ra4 Rook on the semi-open a-file

    Board fact: Black moves the rook from a3 to a4; the rook now works on a semi-open a-file; from a4 it attacks White's pawn on a6.

    Fixed engine check: Near the leading choice · Ra4 Rxh6 Ke5 Rh8.

  27. 43.Rxh6 Exchange on h6

    Board fact: White's rook takes the pawn on h6; from h6 it attacks Black's pawn on f6; white is ahead by 2 conventional material points after the capture.

    Fixed engine check: Ranked first · Rxh6 Ke5 Rh8 Bd5.

PGN

[Event "Linares"] [Site "?"] [Date "1994.??.??"] [White "Kasparov, Garry"] [Black "Illescas Cordoba, Miguel"] [Result "1-0"] 1. c4 Nf6 2. Nc3 c5 3. g3 e6 4. Nf3 Nc6 5. Bg2 d5 6. cxd5 exd5 7. d4 Be7 8. O-O O-O 9. Bg5 cxd4 10. Nxd4 h6 11. Be3 Re8 12. Rc1 Bf8 13. Nxc6 bxc6 14. Na4 Bd7 15. Bc5 Bxc5 16. Nxc5 Bg4 17. Re1 Qa5 18. h3 Bf5 19. Qd4 Rab8 20. a3 Qb5 21. b3 Ne4 22. b4 a5 23. Nxe4 Bxe4 24. Rc5 Qb6 25. bxa5 Qb2 26. Qxb2 Rxb2 27. Rxc6 Ra2 28. Rec1 Rxa3 29. Rc8 Rxc8 30. Rxc8+ Kh7 31. f3 Bf5 32. Rc5 Be6 33. Kf2 g5 34. f4 gxf4 35. gxf4 d4 36. Be4+ Kg7 37. f5 Ba2 38. Bd3 Kf6 39. a6 Ke7 40. Rc6 f6 41. Rc7+ Kd6 42. Rh7 Ra4 43. Rxh6 1-0

Sources and checking

Score source: Chess Database, version 1 by Ana Schaigorodsky (2016), licensed under CC BY 4.0. LibreChess selected the exact score identified by sha256:1cc6ebe88cb2821b3105e72dcfa86eac197499fe43c8b1e46d3182c825f7477b and pins it in the selection manifest.
Exact Figshare tags:
White="Kasparov, Garry"; Black="Illescas Cordoba, Miguel"; Event="Linares 12th"; Date="1994.??.??"; Result="1-0".
Reviewed display mapping: event Linares 12th → Linares. LibreChess parsed the main line with chess.js and stores normalised SAN. Source comments, side variations and termination detail were not retained.

LibreChess checks every SAN move with chess.js and compares the result and move sequence with a stored reference. The engine comparison was calculated offline from the fixed settings above; it is not a source for historical claims. No termination is inferred where the imported score does not preserve one.

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