Apparently comps can't find move 17 (Nxf7) in this game.

[LRoberts]

Haven't tested it extensively...

[Event "Berlin"]
[Site "Berlin"]
[Date "1926.??.??"]
[Round "?"]
[White "Colle, Edgar"]
[Black "Gruenfeld, Ernst"]
[Result "1-0"]
[ECO "E14"]
[PlyCount "53"]
[EventDate "1926.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "GER"]

1. d4 Nf6 2. Nf3 e6 3. e3 b6 4. Bd3 Bb7 5. Nbd2 c5 6. O-O Be7 7. b3 cxd4 8.exd4 d6 9. Bb2 Nbd7 10. c4 O-O 11. Rc1 Re8 12. Re1 Qc7 13. Qe2 Rac8 14. Nf1 Qb8 15. Ng3 Qa8 16. Ng5 g6 17. Nxf7 Kxf7 18. Qxe6+ Kg7 19. d5 Nc5 20. Nf5+ Kf8 21. Qe3 gxf5 22. Qh6+ Kf7 23. Bxf5 Bxd5 24. Rxe7+ Rxe7 25. Qxf6+ Ke8 26. Qh8+ Kf7 27. Bxc8 1-0

[perejaslav]

Colle,E - Gruenfeld,E, Berlin 1926
q1r1r1k1/pb1nbp1p/1p1ppnp1/6N1/2PP4/1P1B2N1/PB2QPPP/2R1R1K1 w - - 0 1

Analysis by Deep Fritz 10.1 (depth=16):

1. +/= (0.46): 17.Nxf7 Kxf7 18.Qxe6+ Kg7 19.d5 Ne5 20.Ne4 Nxe4 21.Bxe4 Rcd8 22.Bxe5+ dxe5 23.Qxe5+ Kg8 24.Qe6+ Kg7 25.Qh3 Bd6 26.Qh4 Bc8
2. +/= (0.43): 17.Qe3 d5 18.Qf4 Qb8 19.Qxb8 Rxb8 20.Nf3 a6 21.Red1 dxc4 22.bxc4 b5 23.c5 Bd5
3. +/= (0.43): 17.Qd2 d5 18.Qf4 Qb8 19.Qxb8 Rxb8 20.Nf3 a6 21.Red1 dxc4 22.bxc4 b5 23.c5 Bd5

But Black could play better ->19. Ne5!?

[LRoberts]

I had a chessbase CD (few years old) and it claimed that the most modern comps couldn't find the move.

I tried with Rybka (single processor) for a bit and it couldn't find it but didn't run it for too long. Interesting that Fritz found it

[Rolf]

Colle,E - Gruenfeld,E, Berlin 1926
q1r1r1k1/pb1nbp1p/1p1ppnp1/6N1/2PP4/1P1B2N1/PB2QPPP/2R1R1K1 w - - 0 1

Analysis by Deep Fritz 10.1 (depth=16):

1. +/= (0.46): 17.Nxf7 Kxf7 18.Qxe6+ Kg7 19.d5 Ne5 20.Ne4 Nxe4 21.Bxe4 Rcd8 22.Bxe5+ dxe5 23.Qxe5+ Kg8 24.Qe6+ Kg7 25.Qh3 Bd6 26.Qh4 Bc8
2. +/= (0.43): 17.Qe3 d5 18.Qf4 Qb8 19.Qxb8 Rxb8 20.Nf3 a6 21.Red1 dxc4 22.bxc4 b5 23.c5 Bd5
3. +/= (0.43): 17.Qd2 d5 18.Qf4 Qb8 19.Qxb8 Rxb8 20.Nf3 a6 21.Red1 dxc4 22.bxc4 b5 23.c5 Bd5

But Black could play better ->19. Ne5!?

Here Fritz 10 as engine in CB gives Nxf7 already at 15/42 and then at 16/41 with a long line


q1r1r1k1/pb1nbp1p/1p1ppnp1/6N1/2PP4/1P1B2N1/PB2QPPP/2R1R1K1 w - - 0 1

Analysis by Fritz 10:

1. ² (0.48): 1.Sxf7 Kxf7 2.Dxe6+ Kf8 3.d5 Se5 4.Lxe5 dxe5 5.Dxe5 Kg7 6.Se4 Db8 7.De6 Sxe4 8.Txe4 Dd6 9.Tce1 Dxe6 10.Txe6 Kf7 11.Kf1 Tcd8
2. ² (0.45): 1.De3 d5 2.Df4 Db8 3.Dxb8 Sxb8 4.Sf3 Sc6 5.Le2 Ld6 6.Se5 a6 7.f4 dxc4 8.bxc4 Se7

(RWT, 13.01.2008)

Rybka 2.3.2a at 17 is still on the idea with a Q move to e3 or d2 both with .12


Fritz 10 at 17/45 now with +.73 but not a line yet. Rybka unchanged at depth 17.

[Uri]

[d]q1r1r1k1/pb1nbp1p/1p1ppnp1/6N1/2PP4/1P1B2N1/PB2QPPP/2R1R1K1 w - - 0 17
Shredder 10 doesn't find Nxf7 either.

Analysis by Shredder 10 (depth 16/16):

1. ² (0.46): 17.Ba3 h6 18.N5e4 d5 19.Nxf6+ Bxf6 20.Qd2 dxc4 21.bxc4 Bxg2 22.d5
2. ² (0.43): 17.f3 d5

[S.Taylor]

[d]q1r1r1k1/pb1nbp1p/1p1ppnp1/6N1/2PP4/1P1B2N1/PB2QPPP/2R1R1K1 w - - 0 17
Shredder 10 doesn't find Nxf7 either.

Analysis by Shredder 10 (depth 16/16):

1. ² (0.46): 17.Ba3 h6 18.N5e4 d5 19.Nxf6+ Bxf6 20.Qd2 dxc4 21.bxc4 Bxg2 22.d5
2. ² (0.43): 17.f3 d5

Is this something to "see"?
I know one thing for sure, that Nxf7 is perhaps the first move I would personally think of, as a human. However I would need to examine if the other white pieces can do anything in time.

[smirobth]

Haven't tested it extensively...

[Event "Berlin"]
[Site "Berlin"]
[Date "1926.??.??"]
[Round "?"]
[White "Colle, Edgar"]
[Black "Gruenfeld, Ernst"]
[Result "1-0"]
[ECO "E14"]
[PlyCount "53"]
[EventDate "1926.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "GER"]

1. d4 Nf6 2. Nf3 e6 3. e3 b6 4. Bd3 Bb7 5. Nbd2 c5 6. O-O Be7 7. b3 cxd4 8.exd4 d6 9. Bb2 Nbd7 10. c4 O-O 11. Rc1 Re8 12. Re1 Qc7 13. Qe2 Rac8 14. Nf1 Qb8 15. Ng3 Qa8 16. Ng5 g6 17. Nxf7 Kxf7 18. Qxe6+ Kg7 19. d5 Nc5 20. Nf5+ Kf8 21. Qe3 gxf5 22. Qh6+ Kf7 23. Bxf5 Bxd5 24. Rxe7+ Rxe7 25. Qxf6+ Ke8 26. Qh8+ Kf7 27. Bxc8 1-0

One reason programs might have trouble is that 17.Nxf7!? doesn't seem to give more than a modest endgame edge if Black defends better with 19...Ne5!; and other move 17 choices for White also seem to retain a slight White advantage.