Details about Leela Chalange in Jerusalem

[Uri Blass]

game 26

[pgn][Event "casual classical game"]
[Site "https://lichess.org/Z4Oc8Kc0"]
[Date "2025.11.29"]
[Round "?"]
[White "LeelaRookOdds"]
[Black "maksmil"]
[Result "1-0"]
[BlackElo "2400"]
[WhiteElo "2400"]
[TimeControl "5400+30"]
[SetUp "1"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/1NBQKBNR w Kkq - 0 1"]
[Termination "normal"]
[PlyCount "109"]
[WhiteType "human"]
[BlackType "human"]

1. Nf3 Nf6 2. e3 d5 3. c4 c5 4. cxd5 Nxd5 5. Nc3 e6 6. Qc2 Nc6 7. Ne4 Ndb4
8. Qb1 Qd5 9. b3 Ne5 (9. .. Nxa2 10. Bc4 Qf5 11. Bd3 (11. Nh4 Qg4) 11. ..
Qg4) 10. Nxe5 Qxe5 11. Be2 Bd7 (11. .. Nxa2? 12. Bb2 Qd5 13. Bc4 Qc6 14.
Bxg7 Bxg7 15. Bb5) 12. Bb2 Qc7 13. O-O Bc6 14. a3 Na6 15. Rc1 Be7 (15. ..
Rd8) 16. Bxg7 Rg8 17. Bc3 O-O-O 18. b4 cxb4 19. axb4 Bxe4 20. Qxe4 Nxb4 21.
g3 Nc6 {give the opponent important passed pawn so not the best)} (21. ..
Rg6 {not losing h7}) (21. .. Rg5 {the idea is Na2 Rc2 Nxc3 and Rc5} 22. Qb1
(22. Qxh7 Na2) 22. .. Rc5 23. Qxb4 Rxd2 24. Qxc5 Bxc5 25. Bxd2) (21. ..
Na2? 22. Rc2) 22. Qxh7 Bd6 23. Bf6 Rdf8 24. Bf3 Rg6 25. Bg7 Rd8 26. Bh5
Rxg7? (26. .. Qe7 27. h4 (27. Bxg6 fxg6 28. Qh6 Qf7) 27. .. Kb8) (26. ..
Be5 {force simplifications} 27. Bxe5 Qxe5 28. Bxg6 fxg6 29. Rb1 Rd7) 27.
Qxg7 Be5 28. Qg5 Rxd2 29. Bf3 Bb2 30. Rc4 Qe5?! {Inaccuracy. Kb8 was
better.} (30. .. Kb8) 31. Qe7 (31. Qg8+ Rd8 32. Qxf7 Qf5! {force trading
queens} 33. Qxf5 exf5 34. Bxc6 bxc6 35. Rxc6+ Kb7 {is winning for black
because the a pawn is unstoppable}) 31. .. Rd7?! {Inaccuracy. still winning
but Qc7 was better.} (31. .. Qc7) 32. Qb4 (32. Qf8+ {may be better but
still losing} Rd8 33. Qb4 (33. Qxf7 Qf5 {force simplification}) 33. .. Rd6)
32. .. Kc7?! {Inaccuracy still winnng but a5 was best.} (32. .. a5 33. Qb6
Ba3) 33. Rc2 Ba1 34. Rc5 Qb2 35. Qa4 Qb6? {still winning but a mistake. Kd8
was best now the win is not easy.} (35. .. Kd8 36. Be4 Qb4 37. Bxc6 Qb1+
38. Kg2 bxc6 39. h4 Bf6 40. h5 Qb6 41. Rxc6) 36. Rxc6+ bxc6 37. Qxa1 a5 38.
h4 Qc5? (38. .. Qb5 {is winning} 39. h5 a4 40. h6 f5 41. Kg2 e5 42. e4 f4
43. g4 Rd8) 39. h5 f5 40. Kg2? {A mistake h6 was leading to draw.} (40. h6
e5 {leads to a draw with correct play}) 40. .. e5 {is winning} 41. Qa2 e4
42. Be2 Rd6? {A mistake. Qc3 was winning.} (42. .. Qc3 {is winning} 43. Qg8
f4 44. exf4 e3 45. Qa8 exf2 46. Qa7+ Kd6 47. Qb8+ Kc5 48. Qf8+ Kb6 49. Qb8+
Rb7) 43. Ba6 Kb6 44. Be2 Qb4 45. Qg8 a4 46. Qb8+ Kc5 47. Qa7+ Kd5 48. Qh7
Rf6 49. Qd7+ Qd6 50. Qb7 a3 51. Qb3+ Ke5?? {A losing blunder. Kc5 was
best.} (51. .. Kc5) 52. Bc4 f4 53. gxf4+ Kf5 54. Qb7 Rf8 55. Qg7 {. Black
resigns} 1-0
[/pgn]

[towforce]

game 26

[pgn][Event "casual classical game"]
[Site "https://lichess.org/Z4Oc8Kc0"]
[Date "2025.11.29"]
[Round "?"]
[White "LeelaRookOdds"]
[Black "maksmil"]
[Result "1-0"]
[BlackElo "2400"]
[WhiteElo "2400"]
[TimeControl "5400+30"]
[SetUp "1"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/1NBQKBNR w Kkq - 0 1"]
[Termination "normal"]
[PlyCount "109"]
[WhiteType "human"]
[BlackType "human"]

1. Nf3 Nf6 2. e3 d5 3. c4 c5 4. cxd5 Nxd5 5. Nc3 e6 6. Qc2 Nc6 7. Ne4 Ndb4
8. Qb1 Qd5 9. b3 Ne5 (9. .. Nxa2 10. Bc4 Qf5 11. Bd3 (11. Nh4 Qg4) 11. ..
Qg4) 10. Nxe5 Qxe5 11. Be2 Bd7 (11. .. Nxa2? 12. Bb2 Qd5 13. Bc4 Qc6 14.
Bxg7 Bxg7 15. Bb5) 12. Bb2 Qc7 13. O-O Bc6 14. a3 Na6 15. Rc1 Be7 (15. ..
Rd8) 16. Bxg7 Rg8 17. Bc3 O-O-O 18. b4 cxb4 19. axb4 Bxe4 20. Qxe4 Nxb4 21.
g3 Nc6 {give the opponent important passed pawn so not the best)} (21. ..
Rg6 {not losing h7}) (21. .. Rg5 {the idea is Na2 Rc2 Nxc3 and Rc5} 22. Qb1
(22. Qxh7 Na2) 22. .. Rc5 23. Qxb4 Rxd2 24. Qxc5 Bxc5 25. Bxd2) (21. ..
Na2? 22. Rc2) 22. Qxh7 Bd6 23. Bf6 Rdf8 24. Bf3 Rg6 25. Bg7 Rd8 26. Bh5
Rxg7? (26. .. Qe7 27. h4 (27. Bxg6 fxg6 28. Qh6 Qf7) 27. .. Kb8) (26. ..
Be5 {force simplifications} 27. Bxe5 Qxe5 28. Bxg6 fxg6 29. Rb1 Rd7) 27.
Qxg7 Be5 28. Qg5 Rxd2 29. Bf3 Bb2 30. Rc4 Qe5?! {Inaccuracy. Kb8 was
better.} (30. .. Kb8) 31. Qe7 (31. Qg8+ Rd8 32. Qxf7 Qf5! {force trading
queens} 33. Qxf5 exf5 34. Bxc6 bxc6 35. Rxc6+ Kb7 {is winning for black
because the a pawn is unstoppable}) 31. .. Rd7?! {Inaccuracy. still winning
but Qc7 was better.} (31. .. Qc7) 32. Qb4 (32. Qf8+ {may be better but
still losing} Rd8 33. Qb4 (33. Qxf7 Qf5 {force simplification}) 33. .. Rd6)
32. .. Kc7?! {Inaccuracy still winnng but a5 was best.} (32. .. a5 33. Qb6
Ba3) 33. Rc2 Ba1 34. Rc5 Qb2 35. Qa4 Qb6? {still winning but a mistake. Kd8
was best now the win is not easy.} (35. .. Kd8 36. Be4 Qb4 37. Bxc6 Qb1+
38. Kg2 bxc6 39. h4 Bf6 40. h5 Qb6 41. Rxc6) 36. Rxc6+ bxc6 37. Qxa1 a5 38.
h4 Qc5? (38. .. Qb5 {is winning} 39. h5 a4 40. h6 f5 41. Kg2 e5 42. e4 f4
43. g4 Rd8) 39. h5 f5 40. Kg2? {A mistake h6 was leading to draw.} (40. h6
e5 {leads to a draw with correct play}) 40. .. e5 {is winning} 41. Qa2 e4
42. Be2 Rd6? {A mistake. Qc3 was winning.} (42. .. Qc3 {is winning} 43. Qg8
f4 44. exf4 e3 45. Qa8 exf2 46. Qa7+ Kd6 47. Qb8+ Kc5 48. Qf8+ Kb6 49. Qb8+
Rb7) 43. Ba6 Kb6 44. Be2 Qb4 45. Qg8 a4 46. Qb8+ Kc5 47. Qa7+ Kd5 48. Qh7
Rf6 49. Qd7+ Qd6 50. Qb7 a3 51. Qb3+ Ke5?? {A losing blunder. Kc5 was
best.} (51. .. Kc5) 52. Bc4 f4 53. gxf4+ Kf5 54. Qb7 Rf8 55. Qg7 {. Black
resigns} 1-0
[/pgn]

Black looked to be winning right up to the moment at which his king was forced into the centre of the board.

Another thoroughly enjoyable game!

[towforce]

In a few of these games, the human appeared to be winning until later in the game, when Leela suddenly found a weakness and exploited it ruthlessly.

I wonder if the humans would be better off playing a safe, defensive game? Maybe they just wouldn't be allowed to.

[Uri Blass]

game 27

[pgn][Event "casual classical game"]
[Site "https://lichess.org/3xomU6B1"]
[Date "2025.11.29"]
[Round "-"]
[White "LeelaRookOdds"]
[Black "gguuyy"]
[Result "1-0"]
[BlackElo "2400"]
[WhiteElo "2400"]
[SetUp "1"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/1NBQKBNR w Kkq - 0 1"]
[Termination "normal"]
[PlyCount "101"]
[WhiteType "human"]
[BlackType "human"]

1. e4 d6 2. d4 e5 3. d5 Nf6 4. Nc3 c6 5. h3 h5 6. Nf3 Be7 7. Be3 Nbd7 8. a4
Qa5 9. Ng5 Nb6!? {imaccuracy. There is a simpler plan to get the advantage}
(9. .. cxd5 10. exd5 a6) 10. Bd2 Nbd7?! {Inaccuracy. Qc5 was best.} (10. ..
Qc5 {withthe idea Nc4} 11. dxc6 (11. Bd3 11. .. Nc4 12. Bc1? Qb4) (11. b3
Nfxd5) 11. .. Nc4) 11. Bc4 c5 12. f4 a6 13. O-O Qc7 14. b3 Rb8 15. Qe2
Nb6?! {Inaccuracy. losing a pawn} (15. .. Qd8 {one of nany moves tharare
better because it does not lose a pawn}) 16. fxe5 Nxc4 17. exf6 (17. Qxc4
dxe5 18. Nxf7 {is another way to win the pawn and inspite of trading some
pieces the position is still not simple}) 17. .. gxf6 18. Nxf7 Kxf7 19.
Qxc4 b5 20. Qe2 Bd7 21. Bf4 Ke8 22. axb5 axb5 23. Ra1 Qb7 24. Qf3 Ra8 25.
Re1 Qb6 26. Be3 Qa5 27. Bf4 Qb6 28. Ne2 Kd8 29. Ng3 h4 30. Nf5 Bxf5 31.
exf5 Ra2 32. Kh2 Rg8 33. Re2 Qb7 34. Bd2 Qa7 (34. .. Qd7 {attack f5 weak
pawn of white is better} 35. Qd3 Kc8 36. Be1 Rh8 37. Qe4 Rh5 38. Bxh4 Rxf5
39. Bg3 (39. Qxe7 Qxe7 40. Rxe7 Rxc2) 39. .. Bd8) 35. Be1 c4 36. Bxh4 Ra1?!
{Inaccuracy. cxb3 or Qc7 were better when cxb3 is more simple way to win}
(36. .. cxb3 37. Bf2 (37. Qxb3 Rg7 38. Qxb5 Qa6) 37. .. Qc7 38. cxb3 Rxe2
39. Qxe2 Qc3 40. Qxb5 Bf8 41. g4 Rh8 42. h4 Rg8 43. Qe2 Qe5+ 44. Qxe5 dxe5)
37. Bf2 Qc7 38. Qe3 cxb3? (38. .. Re8 {is one of the winning moves}) (38.
.. c3) 39. cxb3 Rg7 40. Qh6 Rg8 41. Qh7 Re8 42. Qf7 Rf8 43. Qg7 Re8 44. Bd4
Rd1?? {A losing blunder. Qc1 was.enough for a draw} (44. .. Qc1) 45. Bxf6
Qc1 46. Bxe7+ Kc8 47. Bg5 Rh1+ 48. Kg3 Rxe2 49. Bxc1 Rg1 50. Qc3+ Kd7 51.
Qc6+ {White wins on time.} 1-0
[/pgn]