LibreChessChess, explained simply

Classic game replay

Robert James Fischer vs Izak Aloni, 1962

This replay preserves the complete 77-ply score of Fischer playing White across 39 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
Robert James Fischer
Black
Izak Aloni
Event
Varna olm
Year
1962
Result
1-0
Opening
C11 French Defense: Classical Variation, Burn Variation

Opening reference: French Defense: Classical Variation, Burn Variation (C11).

In this game, 20 half-moves are labelled opening, 43 middlegame and 14 endgame. The score contains 15 captures and 4 checks or mates; before a recorded move, the position offered a median of 32 legal choices. The source score ends after 39.Rg3 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. 6.Nxf6+ — Capture with check on f66.Nxf6+ was a leading choice in the fixed engine check.
  2. 18.Bb3 — Create pressure on e618.Bb3 was a leading choice in the fixed engine check.
  3. 22.Nd3 — Improve the knight22.Nd3 was a leading choice in the fixed engine check.
  4. 31.Rxd5 — Recapture on d531.Rxd5 was a leading choice in the fixed engine check.
  5. 39.Rg3 — Create pressure on g739.Rg3 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.

♜♞♝♛♚♝♞♜♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♜♞♝♛♚♝♞♜
Robert James Fischer vs Izak Aloni, 1962

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.e4 to 10...Nd5

  1. 1.e4 Claim central space

    Board fact: White moves the pawn from e2 to e4; from there it controls d5 and f5.

    Fixed engine check: Ranked first · e4 e5 Nf3 Nc6.

  2. 1...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 d4.

  3. 2.d4 Claim central space

    Board fact: White moves the pawn from d2 to d4; from there it controls e5 and c5.

    Fixed engine check: Ranked first · d4 d5 e5 c5.

  4. 2...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 e4.

    Fixed engine check: Ranked first · d5 e5 c5 c3.

  5. 3.Nc3 Develop the knight

    Board fact: White develops the knight from b1 to c3; from c3 it attacks Black's pawn on d5.

    Fixed engine check: Ranked first · Nc3 Nf6 e5 Nfd7.

  6. 3...Nf6 Develop the knight

    Board fact: Black develops the knight from g8 to f6; from f6 it attacks White's pawn on e4.

    Fixed engine check: Ranked first · Nf6 e5 Nfd7 f4.

  7. 4.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 h6 Bxf6 Qxf6.

  8. 4...dxe4 Exchange on e4

    Board fact: Black's pawn takes the pawn on e4; the move changes the central pawn contact; Black accepts doubled pawns on the e-file; black is ahead by 1 conventional material point after the capture.

    Fixed engine check: Ranked first · dxe4 Nxe4 Nbd7 Nf3.

  9. 5.Nxe4 Recapture on e4

    Board fact: White's knight recaptures the pawn on e4; from e4 it attacks Black's knight on f6; material is level after the capture.

    Fixed engine check: Ranked first · Nxe4 Nbd7 Nxf6+ Nxf6.

  10. 5...Nbd7 Develop the knight

    Board fact: Black develops the knight from b8 to d7; from there it controls e5, c5 and f6.

    Fixed engine check: Ranked first · Nbd7 Nxf6+ Nxf6 Nf3.

  11. 6.Nxf6+ Capture with check on f6

    Board fact: White's knight takes the knight on f6; the move checks Black's king; from f6 it attacks Black's knight on d7 and Black's pawn on h7; white is ahead by 3 conventional material points after the capture.

    Fixed engine check: Ranked first · Nxf6+ Nxf6.

  12. 6...Nxf6 Recapture on f6

    Board fact: Black's knight recaptures the knight on f6; from f6 it reinforces the pawn on h7; material is level after the capture.

    Fixed engine check: Ranked first · Nxf6 Nf3.

  13. 7.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 Be7 Bd3 c5.

  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 Bd3 h6 Bh4.

  15. 8.Bd3 Develop the bishop

    Board fact: White develops the bishop from f1 to d3; from d3 it attacks Black's pawn on h7.

    Fixed engine check: Ranked first · Bd3 h6 Bh4 O-O.

  16. 8...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 Bh4 b6 Qe2.

  17. 9.Bh4 Create pressure on f6

    Board fact: White moves the bishop from g5 to h4; from h4 it attacks Black's knight on f6.

    Fixed engine check: Ranked first · Bh4 O-O.

  18. 9...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 Qe2 Nd5 Bg3.

  19. 10.Qe2 Create pressure on e6

    Board fact: White moves the queen from d1 to e2; from e2 it attacks Black's pawn on e6.

    Fixed engine check: Ranked first · Qe2 c5.

  20. 10...Nd5 Improve the knight

    Board fact: Black moves the knight from f6 to d5; from there it controls c3, e3 and f4.

    Fixed engine check: Ranked first · Nd5 Bxe7.

Middlegame · 11.Bg3 to 32.Rxe8+

  1. 11.Bg3 Create pressure on c7

    Board fact: White moves the bishop from h4 to g3; from g3 it attacks Black's pawn on c7.

    Fixed engine check: Ranked first · Bg3 Bb4+ Nd2 Bd6.

  2. 11...Bb4+ A forcing check

    Board fact: Black moves the bishop from e7 to b4; the move checks White's king; from there it controls c3, c5 and d6.

    Fixed engine check: Ranked first · Bb4+ Nd2 a6 a3.

  3. 12.Nd2 Answering the check

    Board fact: White answers the check by moving the knight from f3 to d2; from there it controls e4, c4 and f3.

    Fixed engine check: Ranked first · Nd2 Bd6 a3 b5.

  4. 12...f5 Advance the f-pawn

    Board fact: Black moves the pawn from f7 to f5; from there it controls e4.

    Fixed engine check: Near the leading choice · f5 Be5 Bd6 c3.

  5. 13.Be5 Create pressure on c7

    Board fact: White moves the bishop from g3 to e5; from e5 it attacks Black's pawn on c7 and Black's pawn on g7.

    Fixed engine check: Ranked first · Be5 Bd6.

  6. 13...Bd6 Create pressure on e5

    Board fact: Black moves the bishop from b4 to d6; from d6 it attacks White's bishop on e5.

    Fixed engine check: Ranked first · Bd6.

  7. 14.c3 Advance the c-pawn

    Board fact: White moves the pawn from c2 to c3; from there it controls d4.

    Fixed engine check: Ranked first · c3 Bd7.

  8. 14...Bxe5 Exchange on e5

    Board fact: Black's bishop takes the bishop on e5; from e5 it attacks White's pawn on d4 and White's pawn on h2; black is ahead by 3 conventional material points after the capture.

    Fixed engine check: Near the leading choice · Bxe5 Qxe5.

  9. 15.Qxe5 Recapture on e5

    Board fact: White's queen recaptures the bishop on e5; from e5 it attacks Black's knight on d5 and Black's pawn on c7; material is level after the capture.

    Fixed engine check: Ranked first · Qxe5.

  10. 15...Qf6 Create pressure on e5

    Board fact: Black moves the queen from d8 to f6; from f6 it attacks White's queen on e5.

    Fixed engine check: Ranked first · Qf6 Nf3 b6 O-O.

  11. 16.Nf3 Improve the knight

    Board fact: White moves the knight from d2 to f3; from there it controls d4 and e5.

    Fixed engine check: Ranked first · Nf3 b6.

  12. 16...Bd7 Develop the bishop

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

    Fixed engine check: Ranked first · Bd7 O-O-O Be8 Rde1.

  13. 17.Bc4 Create pressure on d5

    Board fact: White moves the bishop from d3 to c4; from c4 it attacks Black's knight on d5.

    Fixed engine check: Near the leading choice · Bc4 Bc6 O-O Qxe5.

  14. 17...Nb6 Create pressure on c4

    Board fact: Black moves the knight from d5 to b6; from b6 it attacks White's bishop on c4.

    Fixed engine check: Playable; Bc6 ranked higher · Nb6 Bb3.

  15. 18.Bb3 Create pressure on e6

    Board fact: White moves the bishop from c4 to b3; from b3 it attacks Black's pawn on e6.

    Fixed engine check: Ranked first · Bb3.

  16. 18...Rac8 Improve the rook

    Board fact: Black moves the rook from a8 to c8; from c8 it reinforces the rook on f8.

    Fixed engine check: Near the leading choice · Rac8.

  17. 19.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 Qxe5 Nxe5 Rce8.

  18. 19...Qxe5 Exchange on e5

    Board fact: Black's queen takes the queen on e5; from e5 it attacks White's pawn on d4 and White's pawn on h2; black is ahead by 9 conventional material points after the capture.

    Fixed engine check: Ranked first · Qxe5 Nxe5.

  19. 20.Nxe5 Recapture on e5

    Board fact: White's knight recaptures the queen on e5; from e5 it attacks Black's bishop on d7; material is level after the capture.

    Fixed engine check: Ranked first · Nxe5 Rce8 a4 a5.

  20. 20...Rfe8 Improve the rook

    Board fact: Black moves the rook from f8 to e8; from there it controls e6.

    Fixed engine check: Near the leading choice · Rfe8 Rfe1.

  21. 21.Rfe1 Rook on the semi-open e-file

    Board fact: White moves the rook from f1 to e1; the rook now works on a semi-open e-file; from there it controls e4, e5 and e3.

    Fixed engine check: Ranked first · Rfe1 Ba4 Nd3 Bxb3.

  22. 21...Ba4 Create pressure on b3

    Board fact: Black moves the bishop from d7 to a4; from a4 it attacks White's bishop on b3.

    Fixed engine check: Ranked first · Ba4 Nd3 Bxb3 axb3.

  23. 22.Nd3 Improve the knight

    Board fact: White moves the knight from e5 to d3; from there it controls e5, c5 and f4.

    Fixed engine check: Ranked first · Nd3 Bxb3 axb3 e5.

  24. 22...Bxb3 Exchange on b3

    Board fact: Black's bishop takes the bishop on b3; from b3 it attacks White's pawn on a2; black is ahead by 3 conventional material points after the capture.

    Fixed engine check: Ranked first · Bxb3 axb3 e5 Nxe5.

  25. 23.axb3 Recapture on b3

    Board fact: White's pawn recaptures the bishop on b3; the move changes the central pawn contact; White accepts doubled pawns on the b-file; material is level after the capture.

    Fixed engine check: Ranked first · axb3 a6 Nc5 e5.

  26. 23...a6 Advance the a-pawn

    Board fact: Black moves the pawn from a7 to a6.

    Fixed engine check: Near the leading choice · a6 Nc5 Rb8 Nxe6.

  27. 24.Nc5 Create pressure on a6

    Board fact: White moves the knight from d3 to c5; from c5 it attacks Black's pawn on a6 and Black's pawn on b7.

    Fixed engine check: Ranked first · Nc5 Rb8 Nxe6 Kf7.

  28. 24...Rb8 Improve the rook

    Board fact: Black moves the rook from c8 to b8; from b8 it reinforces the rook on e8.

    Fixed engine check: Ranked first · Rb8 Nxe6 Kf7 Nc5.

  29. 25.Nxe6 Exchange on e6

    Board fact: White's knight takes the pawn on e6; from e6 it attacks Black's pawn on c7 and Black's pawn on g7; white is ahead by 1 conventional material point after the capture.

    Fixed engine check: Ranked first · Nxe6 Kf7 Nc5 Rxe1+.

  30. 25...Re7 Rook on the open e-file

    Board fact: Black moves the rook from e8 to e7; the rook now occupies the open e-file; from e7 it attacks White's knight on e6.

    Fixed engine check: Near the leading choice · Re7 Nc5 Nd5 g3.

  31. 26.Nc5 Create pressure on a6

    Board fact: White moves the knight from e6 to c5; from c5 it attacks Black's pawn on a6 and Black's pawn on b7.

    Fixed engine check: Ranked first · Nc5 Nd5 Kf1 g5.

  32. 26...Rf7 Improve the rook

    Board fact: Black moves the rook from e7 to f7; from there it controls f5 and f6.

    Fixed engine check: Playable; Nd5 ranked higher · Rf7 Re5 g6 h4.

  33. 27.Re5 Rook on the open e-file

    Board fact: White moves the rook from e1 to e5; the rook now occupies the open e-file; from e5 it attacks Black's pawn on f5.

    Fixed engine check: Ranked first · Re5 c6 Rae1 a5.

  34. 27...c6 Advance the c-pawn

    Board fact: Black moves the pawn from c7 to c6; from there it controls d5.

    Fixed engine check: Ranked first · c6 Rae1 Nd5 Kf1.

  35. 28.Rae1 Rook on the open e-file

    Board fact: White moves the rook from a1 to e1; the rook now occupies the open e-file; from there it controls e4, e5 and e3.

    Fixed engine check: Ranked first · Rae1 Nd5 Nd3 Ra8.

  36. 28...Kf8 Reposition the king

    Board fact: Black moves the king from g8 to f8; from f8 it reinforces the rook on f7.

    Fixed engine check: Ranked first · Kf8 g3 Nd5 h4.

  37. 29.c4 Advance the c-pawn

    Board fact: White moves the pawn from c3 to c4; from there it controls d5.

    Fixed engine check: Playable; h4 ranked higher · c4.

  38. 29...Na8 Reroute the knight

    Board fact: Black moves the knight from b6 to a8.

    Fixed engine check: Playable; Nd7 ranked higher · Na8 h4 Nc7 h5.

  39. 30.d5 Change the pawn structure

    Board fact: White moves the pawn from d4 to d5; the move changes the central pawn contact; from d5 it attacks Black's pawn on c6.

    Fixed engine check: Ranked first · d5 cxd5 Rxd5 Kg8.

  40. 30...cxd5 Exchange on d5

    Board fact: Black's pawn takes the pawn on d5; the move changes the central pawn contact; from d5 it attacks White's pawn on c4; material is level after the capture.

    Fixed engine check: Ranked first · cxd5 Rxd5 Kg8 Nd7.

  41. 31.Rxd5 Recapture on d5

    Board fact: White's rook recaptures the pawn on d5; the rook now occupies the open d-file; from d5 it attacks Black's pawn on f5; white is ahead by 1 conventional material point after the capture.

    Fixed engine check: Ranked first · Rxd5 Kg8 Nd7 Rc8.

  42. 31...Re8 Rook on the open e-file

    Board fact: Black moves the rook from b8 to e8; the rook now occupies the open e-file; from e8 it attacks White's rook on e1.

    Fixed engine check: Near the leading choice · Re8 Rxe8+ Kxe8 f4.

  43. 32.Rxe8+ Capture with check on e8

    Board fact: White's rook takes the rook on e8; the move checks Black's king; the rook now occupies the open e-file; from e8 it attacks Black's knight on a8; white is ahead by 6 conventional material points after the capture.

    Fixed engine check: Ranked first · Rxe8+ Kxe8 Re5+ Kd8.

Endgame · 32...Kxe8 to 39.Rg3

  1. 32...Kxe8 Recapture on e8

    Board fact: Black's king recaptures the rook on e8; from e8 it reinforces the rook on f7; white is ahead by 1 conventional material point after the capture.

    Fixed engine check: Ranked first · Kxe8 Kf1 Nb6 Re5+.

  2. 33.Kf1 Activate the king

    Board fact: White moves the king from g1 to f1; from f1 it reinforces the pawn on f2.

    Fixed engine check: Ranked first · Kf1 Nb6 Re5+ Kd8.

  3. 33...Nb6 Develop the knight

    Board fact: Black develops the knight from a8 to b6; from b6 it attacks White's rook on d5 and White's pawn on c4.

    Fixed engine check: Ranked first · Nb6 Re5+ Kd8 Ne6+.

  4. 34.Re5+ A forcing check

    Board fact: White moves the rook from d5 to e5; the move checks Black's king; the rook now occupies the open e-file; from e5 it attacks Black's pawn on f5.

    Fixed engine check: Near the leading choice · Re5+ Kd8 Ne6+ Kc8.

  5. 34...Kd8 Answering the check

    Board fact: Black answers the check by moving the king from e8 to d8; the reduced material makes this king activation practical.

    Fixed engine check: Ranked first · Kd8 Ke2 Kc7 Kd3.

  6. 35.Re6 Rook on the open e-file

    Board fact: White moves the rook from e5 to e6; the rook now occupies the open e-file; from e6 it attacks Black's knight on b6 and Black's pawn on h6.

    Fixed engine check: Ranked first · Re6 Nc8 Ke2 Kc7.

  7. 35...Nc8 Reroute the knight

    Board fact: Black moves the knight from b6 to c8; from there it controls d6.

    Fixed engine check: Ranked first · Nc8 b4 Kc7 Ke2.

  8. 36.Rg6 Create pressure on a6

    Board fact: White moves the rook from e6 to g6; from g6 it attacks Black's pawn on a6 and Black's pawn on g7.

    Fixed engine check: Near the leading choice · Rg6 Ne7 Rxg7 Rxg7.

  9. 36...Ke8 Activate the king

    Board fact: Black moves the king from d8 to e8; from e8 it reinforces the rook on f7.

    Fixed engine check: Ranked first · Ke8 Re6+ Kd8 Ke2.

  10. 37.Ne6 Create pressure on g7

    Board fact: White moves the knight from c5 to e6; from e6 it attacks Black's pawn on g7.

    Fixed engine check: Recorded move; Re6+ ranked higher · Ne6 Re7.

  11. 37...Re7 Rook on the open e-file

    Board fact: Black moves the rook from f7 to e7; the rook now occupies the open e-file; from e7 it attacks White's knight on e6.

    Fixed engine check: Ranked first · Re7 Nd4 Kf7 Rg3.

  12. 38.Nf4 Improve the knight

    Board fact: White moves the knight from e6 to f4; from there it controls d5, d3 and e6.

    Fixed engine check: Near the leading choice · Nf4 Kf7 Rg3 g5.

  13. 38...Kf7 Create pressure on g6

    Board fact: Black moves the king from e8 to f7; from f7 it attacks White's rook on g6.

    Fixed engine check: Ranked first · Kf7 Rg3 g5 Nd5.

  14. 39.Rg3 Create pressure on g7

    Board fact: White moves the rook from g6 to g3; from g3 it attacks Black's pawn on g7.

    Fixed engine check: Ranked first · Rg3 Re4 Nd3 b6.

PGN

[Event "Varna olm"] [Site "?"] [Date "1962.??.??"] [White "Fischer, Robert James"] [Black "Aloni, Izak"] [Result "1-0"] 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Nbd7 6. Nxf6+ Nxf6 7. Nf3 Be7 8. Bd3 h6 9. Bh4 O-O 10. Qe2 Nd5 11. Bg3 Bb4+ 12. Nd2 f5 13. Be5 Bd6 14. c3 Bxe5 15. Qxe5 Qf6 16. Nf3 Bd7 17. Bc4 Nb6 18. Bb3 Rac8 19. O-O Qxe5 20. Nxe5 Rfe8 21. Rfe1 Ba4 22. Nd3 Bxb3 23. axb3 a6 24. Nc5 Rb8 25. Nxe6 Re7 26. Nc5 Rf7 27. Re5 c6 28. Rae1 Kf8 29. c4 Na8 30. d5 cxd5 31. Rxd5 Re8 32. Rxe8+ Kxe8 33. Kf1 Nb6 34. Re5+ Kd8 35. Re6 Nc8 36. Rg6 Ke8 37. Ne6 Re7 38. Nf4 Kf7 39. Rg3 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 sha256:937db91f8c314304c7368c3eebafbc9ea24524154a7eb7348d85890e862640c0 and pins it in the selection manifest.
Exact Figshare tags:
White="Fischer, Robert James"; Black="Aloni, Izak"; Event="Varna ol (Men) qual-B"; Date="1962.??.??"; Result="1-0".
Reviewed display mapping: event Varna ol (Men) qual-B → Varna olm. 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.

Try today's selected positionsOpen the analysis board

Continue with another game

For a method you can apply to your own games, continue with studying model games and advanced candidate selection.