Three Test positions from Larsen, Euwe and Gufeld!

MMoisan · Post by **MMoisan** » Sun Oct 04, 2015 5:01 am

1.Trojanescu-Larsen, Wageningen 1957
[D]r5k1/pp4pp/2npb2q/2p1p2r/2P2p1P/1P1P1BP1/P1N1PP1K/R3QR2 b - - 0 22

A classic king-side demolition, Larsen to play and crush!

Code: Select all

&#91;Event "Wageningen zt"&#93;
&#91;Site "Wageningen"&#93;
&#91;Date "1957.11.02"&#93;
&#91;Round "4"&#93;
&#91;White "Troianescu, Octavio"&#93;
&#91;Black "Larsen, Bent"&#93;
&#91;Result "1-0"&#93;
&#91;ECO "A04"&#93;
&#91;PlyCount "54"&#93;
&#91;EventDate "1957.10.27"&#93;

1. c4 f5 2. Nf3 Nf6 3. g3 d6 4. Bg2 e5 5. d3 Be7 6. O-O O-O 7. b3 c5 8. Nc3 Nc6
9. Bg5 Be6 10. Ne1 Ng4 11. Bxe7 Qxe7 12. Nd5 Qd7 13. Nc2 f4 14. Qd2 Qf7 15. h3
Nf6 16. Nxf6+ Qxf6 17. Kh2 Qh6 18. Qd1 Bg4 19. Qe1 Rf5 20. h4 Rh5 21. Bd5+ Be6
22. Bf3 Rxh4+ 23. gxh4 Qxh4+ 24. Kg1 Bh3 25. e3 Rf8 26. Qe2 Rf6 27. Bd5+ Kf8
0-1

2.Euwe-Smyslov, Moscow 1948
[D]3b2n1/1q3p1k/6pp/np2N3/2bBPN2/1pP4P/4QPP1/1B4K1 w - - 0 33

According to the tournament's bulletin, Euwe's 33th move is winning, if followed by 34. Qg4! Can your favorite engine find that? (This one is probably harder)

Code: Select all

&#91;Event "World Championship 18th"&#93;
&#91;Site "The Hague/Moscow"&#93;
&#91;Date "1948.03.09"&#93;
&#91;Round "4"&#93;
&#91;White "Euwe, Max"&#93;
&#91;Black "Smyslov, Vassily"&#93;
&#91;Result "0-1"&#93;
&#91;ECO "C98"&#93;
&#91;PlyCount "84"&#93;
&#91;EventDate "1948.03.02"&#93;
&#91;EventType "tourn"&#93;

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3
d6 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Nc6 13. dxc5 dxc5 14. Nf1 Be6 15.
Ne3 Rad8 16. Qe2 g6 17. Ng5 Bc8 18. Bd2 Kg7 19. Rad1 h6 20. Nf3 Be6 21. a4 Qb8
22. Bc1 Rxd1 23. Rxd1 Rd8 24. Rxd8 Bxd8 25. axb5 axb5 26. Nd5 Ng8 27. Be3 c4
28. b3 Na5 29. Nxe5 cxb3 30. Bb1 Qb7 31. Bd4 Kh7 32. Nf4 Bc4 33. Nexg6 fxg6 34.
Nxg6 Kxg6 35. e5+ Kf7 36. Qh5+ Kf8 37. f4 Bb6 38. Qf5+ Ke7 39. Qh7+ Kd8 40.
Bxb6+ Qxb6+ 41. Kh2 Qe3 42. Qf5 Nc6 0-1

3.Smyslov-Gufeld, Moscow 1967
[D]rnb2r2/3pppkp/p5p1/qPpQ4/P1P1n3/4PN2/4KPPP/RN3B1R b - - 0 12

Gufeld's double piece sacrifice on the twelfth and thirtteenth move is truely spectacular, but apparently only leads to a draw with best play. Can your engine find 12...Nd6!! which yields black the advantage?

Code: Select all

&#91;Event "URS Spartakiad final-A"&#93;
&#91;Site "Moscow"&#93;
&#91;Date "1967.??.??"&#93;
&#91;Round "4.3"&#93;
&#91;White "Smyslov, Vassily"&#93;
&#91;Black "Gufeld, Eduard"&#93;
&#91;Result "0-1"&#93;
&#91;ECO "A15"&#93;
&#91;PlyCount "70"&#93;
&#91;EventDate "1967.07.24"&#93;
&#91;EventType "team-tourn"&#93;

1. c4 Nf6 2. Nf3 g6 3. b4 Bg7 4. Bb2 O-O 5. e3 b6 6. d4 c5 7. dxc5 bxc5 8. b5
a6 9. a4 Ne4 10. Bxg7 Kxg7 11. Qd5 Qa5+ 12. Ke2 Bb7 13. Qxb7 Nc6 14. Nfd2 Ra7
15. bxc6 Rxb7 16. cxb7 Qb4 17. Nxe4 Qb2+ 18. Nbd2 Qxa1 19. Nxc5 Rb8 20. g3 Qa3
21. Nxd7 Rxb7 22. Bh3 Qd6 23. c5 Qd5 24. f3 Rb2 25. Rd1 e6 26. c6 Qc4+ 27. Ke1
Qd3 28. Bf1 Qxe3+ 29. Be2 a5 30. f4 f6 31. c7 Rc2 32. Kf1 Rxc7 33. Nc4 Rxc4 34.
Bxc4 Qf3+ 35. Ke1 Qc3+ 0-1

[/quote]

kgburcham · Post by **kgburcham** » Sun Oct 04, 2015 5:21 am

[D] r5k1/pp4pp/2npb2q/2p1p2r/2P2p1P/1P1P1BP1/P1N1PP1K/R3QR2 b - -

Engine: Stockfish 031015 64 BMI2 (8192 MB)
by Tord Romstad, Marco Costalba and Joona
19/31 0:01 -0.91 22...Rf5 23.Rg1 Raf8 24.Rg2 R5f7 25.Kh1 fxg3 26.fxg3 Qf6 27.Rb1 Nd4 28.Nxd4 exd4 29.b4 b6 30.b5 Qf5 31.g4 Qf4 (17.214.687) 12287
20/31 0:01 -0.86 22...Rf5 23.Rg1 Raf8 24.Rg2 R5f7 25.Kh1 g5 26.Rh2 g4 27.Be4 Qf6 28.Rg2 h5 29.Qd2 Qe7 30.Rgg1 Nd4 31.Nxd4 exd4 32.b4 fxg3 (18.798.224) 12399
21/34 0:01 -1.86 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh2 Rf8 26.Bg2 Rf6 27.f3 Rh6+ 28.Kg1 Qh5 29.Rf2 Qh2+ 30.Kf1 Bh3 31.e4 Rg6 32.Ke2 Bxg2 33.Kd2 h5 34.b4 cxb4 35.Rb1 Qg3 (22.327.490) 12635
22/41 0:01 -1.51 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh2 Rf8 26.Bg2 Rf6 27.f3 Rh6+ 28.Kg1 Qh5 29.Rf2 Qh2+ 30.Kf1 Bh3 31.e3 Rg6 32.Ke2 fxe3 33.Bxh3 exf2 34.Qf1 Rg1 35.Qxf2 Nd4+ (22.899.353) 12331
23/41 0:01 -1.65 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh2 Rf8 26.Bg2 Rf6 27.f3 Rh6+ 28.Kg1 Qh5 29.Rf2 Qh2+ 30.Kf1 Bh3 31.e3 Rg6 32.Ke2 fxe3 33.Bxh3 exf2 34.Qf1 Rg1 35.Qxf2 Nd4+ (23.462.546) 12226
24/42 0:02 -1.98 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh2 Rf8 26.Bg2 Rf6 27.f3 Rh6+ 28.Kg1 Qh5 29.Rf2 Qh2+ 30.Kf1 Bh3 31.e4 Rg6 32.Bxh3 Rg1+ 33.Ke2 Rxe1+ 34.Rxe1 Qxh3 35.Rg1 Qh4 (25.004.033) 12161
25/44 0:02 -2.03 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh2 Rf8 26.Bg2 Rf6 27.f3 Rh6+ 28.Kg1 Qh5 29.Rf2 Qh2+ 30.Kf1 Bh3 31.e4 Rg6 32.Ke2 Bxg2 33.Kd2 h5 34.b4 cxb4 35.Rb1 h4 (27.376.842) 12183
26/44 0:02 -1.54 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh1 Rf8 26.Bg2 Rf6 27.f3 Qh5+ 28.Kg1 Rh6 29.Rf2 Qh2+ 30.Kf1 Bh3 31.e3 Rg6 32.Ke2 fxe3 33.Nxe3 Bxg2 34.Kd1 Nd4 35.Kc1 Qf4 (30.280.471) 12364
27/48 0:02 -1.71 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh1 Rf8 26.Bg2 Qh5+ 27.Kg1 Rf6 28.f3 Rh6 29.Rf2 Qh2+ 30.Kf1 Bh3 31.e3 Rg6 32.Ke2 fxe3 33.Nxe3 Bxg2 34.Kd1 Nd4 35.Kc1 Qf4 (32.971.377) 12451
28/48 0:02 -1.64 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh1 Rf8 26.Bg2 Qh5+ 27.Kg1 Rf6 28.f3 Rh6 29.Rf2 Qh2+ 30.Kf1 Rg6 31.e3 Bh3 32.Ke2 fxe3 33.Nxe3 Bxg2 34.Kd1 Nd4 35.Kc1 Qf4 (37.317.951) 12447
29/48 0:03 -1.58-- 22...Rxh4+ 23.gxh4 (40.444.155) 12575
29/48 0:03 -1.52-- 22...Rxh4+ 23.gxh4 (42.469.507) 12681
29/48 0:03 -1.58++ 22...Rxh4+ (44.873.391) 12820
29/48 0:03 -1.58 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh1 Rf8 26.Bg2 Rf6 27.f3 Rh6+ 28.Kg1 Qh5 29.Rf2 Qh2+ 30.Kf1 Rg6 31.e3 Bh3 32.Ke2 Rxg2 33.e4 h5 34.b4 cxb4 35.Rxg2 Bxg2 (44.957.032) 12819
30/48 0:03 -1.64++ 22...Rxh4+ (46.558.779) 12904
30/48 0:03 -1.70++ 22...Rxh4+ (47.484.093) 12927
30/48 0:03 -1.75 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh1 Rf8 26.Bg2 Rf6 27.f3 Rh6+ 28.Kg1 Qh5 29.Rf2 Qh2+ 30.Kf1 Rg6 31.e3 Bh3 32.Ke2 Rxg2 33.e4 h5 34.Rxg2 Bxg2 35.Qf2 h4 (49.388.036) 12976
31/48 0:04 -1.81++ 22...Rxh4+ (53.387.728) 12983
31/48 0:04 -1.75-- 22...Rxh4+ 23.gxh4 (54.318.084) 12997
31/48 0:04 -1.81++ 22...Rxh4+ (54.933.858) 13011
31/49 0:04 -1.95++ 22...Rxh4+ (58.598.009) 13182
31/49 0:04 -1.84-- 22...Rxh4+ 23.gxh4 (59.091.320) 13190
31/50 0:05 -2.00++ 22...Rxh4+ (69.817.928) 13454
31/57 0:06 -2.06 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh1 Rf8 26.Bg2 Qh6+ 27.Kg1 Bh3 28.f3 Rf5 29.Rf2 Rh5 30.Qf1 Bxg2 31.Qxg2 Rg5 32.Rb1 Rxg2+ 33.Rxg2 b6 34.b4 Qf6 35.bxc5 dxc5 (86.603.924) 13872
32/57 0:07 -2.12++ 22...Rxh4+ (107.917.597) 14337
32/57 0:07 -2.11 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh1 Rf8 26.Bg2 Qh6+ 27.Kg1 Bh3 28.f3 Rf5 29.Rf2 Rh5 30.Qf1 Bxg2 31.Qxg2 Rg5 32.Rb1 Rxg2+ 33.Rxg2 Qf6 34.b4 b6 35.bxc5 dxc5 (109.543.095) 14347
33/57 0:08 -2.17++ 22...Rxh4+ (123.787.039) 14595
33/57 0:08 -2.17 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh1 Rf8 26.Bg2 Qh6+ 27.Kg1 Bh3 28.f3 Rf5 29.Rf2 Rh5 30.Qf1 Bxg2 31.Qxg2 Rg5 32.Rb1 Rxg2+ 33.Rxg2 Qf6 34.b4 b6 35.bxc5 dxc5 (129.292.588) 14645
34/57 0:10 -2.23++ 22...Rxh4+ (150.573.451) 14931
34/57 0:10 -2.23 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh1 Rf8 26.Bg2 Qh6+ 27.Kg1 Bh3 28.f3 Rf5 29.Rf2 Rh5 30.Qf1 Bxg2 31.Qxg2 Rg5 32.Rb1 Rxg2+ 33.Rxg2 Qf6 34.b4 b6 35.bxc5 dxc5 (154.598.387) 14957
35/58 0:12 -2.29++ 22...Rxh4+ (183.885.873) 15257
35/63 0:13 -2.23-- 22...Rxh4+ 23.gxh4 (206.750.683) 15415
35/63 0:13 -2.29++ 22...Rxh4+ (208.346.188) 15417
35/63 0:15 -2.23 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh1 Rf8 26.Bg2 Qh6+ 27.Kg1 Bh3 28.f3 Rf5 29.Rf2 Rh5 30.Qf1 Bxg2 31.Qxg2 Rg5 32.Rb1 Rxg2+ 33.Rxg2 Qf6 34.b4 b6 35.bxc5 dxc5 (238.144.722) 15623
36/63 0:16 -2.29++ 22...Rxh4+ (259.365.429) 15708
36/63 0:17 -2.36++ 22...Rxh4+ (280.366.314) 15781
36/63 0:25 -2.36 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh1 Rf8 26.Bg2 Qh6+ 27.Kg1 Bh3 28.f3 Rf5 29.Rf2 Rh5 30.Qf1 Bxg2 31.Qxg2 Rg5 32.Rb1 Rxg2+ 33.Rxg2 Qf6 34.b4 b6 35.bxc5 dxc5 (408.813.310) 16276
37/63 0:37 -2.29-- 22...Rxh4+ 23.gxh4 (628.101.215) 16701
37/63 0:38 -2.23-- 22...Rxh4+ 23.gxh4 (639.409.335) 16718
37/63 0:43 -2.14-- 22...Rxh4+ 23.gxh4 (742.713.847) 16897
37/63 0:45 -2.22++ 22...Rxh4+ (776.823.488) 16909
37/63 0:48 -2.42 22...Rxh4+ 23.gxh4 Qxh4+ 24.Kg1 Qg5+ 25.Kh2 Rf8 26.Bg2 Qh6+ 27.Kg1 Bh3 28.f3 Rf5 29.Rf2 Rh5 30.Qf1 Bxg2 31.Qxg2 Rg5 32.Rb1 Rxg2+ 33.Rxg2 Qf6 34.b4 b6 35.bxc5 dxc5 (811.907.134) 16914
38/64 0:57 -2.48++ 22...Rxh4+ (983.645.939) 16990

kgburcham · Post by **kgburcham** » Sun Oct 04, 2015 5:25 am

[D] 3b2n1/1q3p1k/6pp/np2N3/2bBPN2/1pP4P/4QPP1/1B4K1 w - -

8 processor(s) found, POPCNT available
NUMA configuration with 1 node(s), offset 0
8192 MB Hash
Nalimov 6 men EGTB available - 800 MB cache
Engine: Houdini 4 Pro x64 (8192 MB)
by Robert Houdart
other best move - reduce depth to 14

24/87 0:20 +0.63-- 33.Qg4 h5 (427.206.806) 21240 TB:5.669
24/87 0:27 +0.82++ 33.Nexg6 (599.797.951) 21559 TB:5.680
24/87 0:30 +1.00++ 33.Nexg6 (671.149.901) 21675 TB:5.689
other best move - reduce depth to 21
21/87 0:33 +1.44++ 33.Nexg6 (718.003.766) 21522 TB:5.752
21/89 0:40 +1.54 33.Nexg6 fxg6 34.Qg4 Bf7 35.e5 Ne7 36.h4 Nac6 37.h5 Nxd4 38.hxg6+ Nxg6 39.Bxg6+ Kh8 40.cxd4 Bg5 41.Bxf7 Qxf7 42.e6 Qb7 43.Nd3 Qa8 44.Kh2 Qd5 45.Ne5 Bf6 46.Qf5 (856.473.234) 21354 TB:7.367
22/89 0:40 +1.64++ 33.Nexg6 (868.504.465) 21357 TB:7.367
22/89 0:41 +1.85++ 33.Nexg6 (887.735.137) 21346 TB:7.418
22/89 0:42 +1.44-- 33.Nexg6 fxg6 (896.181.852) 21336 TB:7.434
22/89 0:44 +1.39 33.Nexg6 fxg6 34.Qg4 Bf7 35.e5 Ne7 36.h4 Nac6 37.h5 Nxd4 38.hxg6+ Nxg6 39.Bxg6+ Kh8 40.cxd4 Bg5 41.Bxf7 Qxf7 42.e6 Qe8 43.Nd3 Qc6 44.Qf5 b2 45.Nxb2 Qc1+ 46.Kh2 (952.739.537) 21340 TB:9.409
23/91 0:45 +1.49++ 33.Nexg6 (976.095.961) 21337 TB:10.187
23/91 0:46 +1.49 33.Nexg6 fxg6 34.Qg4 Bf7 35.e5 Ne7 36.h4 Nac6 37.h5 Nxd4 38.hxg6+ Nxg6 39.Bxg6+ Kh8 40.cxd4 Bg5 41.Bxf7 Qxf7 42.e6 Qe8 43.Nd3 Qc6 44.Qf5 b2 45.Nxb2 Qc1+ 46.Kh2 (997.256.875) 21338 TB:10.332
24/91 0:47 +1.39-- 33.Nexg6 fxg6 (1.025.700.069) 21401 TB:10.611
24/91 0:49 +1.29 33.Nexg6 fxg6 34.Qg4 Bf7 35.e5 Ne7 36.h4 Nac6 37.h5 Nxd4 38.hxg6+ Nxg6 39.Bxg6+ Kh8 40.cxd4 Bg5 41.Bxf7 Qxf7 42.e6 Qe8 43.Nd3 Qc6 44.Qf5 b2 45.Nxb2 Qc1+ 46.Kh2 (1.071.510.099) 21460 TB:10.750
25/91 0:55 +1.39++ 33.Nexg6 (1.198.533.907) 21604 TB:12.058
25/91 1:00 +1.60++ 33.Nexg6 (1.314.909.258) 21701 TB:12.808

Eelco de Groot · Post by **Eelco de Groot** » Sun Oct 04, 2015 8:02 pm

kgburcham wrote:[D] 3b2n1/1q3p1k/6pp/np2N3/2bBPN2/1pP4P/4QPP1/1B4K1 w - -

8 processor(s) found, POPCNT available
NUMA configuration with 1 node(s), offset 0
8192 MB Hash
Nalimov 6 men EGTB available - 800 MB cache
Engine: Houdini 4 Pro x64 (8192 MB)
by Robert Houdart
other best move - reduce depth to 14

24/87 0:20 +0.63-- 33.Qg4 h5 (427.206.806) 21240 TB:5.669
24/87 0:27 +0.82++ 33.Nexg6 (599.797.951) 21559 TB:5.680

Rainbow Serpent needed about double the number of nodes. Maybe it was a bit harder also because it thinks 33. Nxc44 is also a nice move.

3b2n1/1q3p1k/6pp/np2N3/2bBPN2/1pP4P/4QPP1/1B4K1 w - -

Engine: Rainbow Serpent Sf20150919_001 MOD MP (512 MB)
by Tord Romstad, Marco Costalba and Joona Kiiski

16/28 0:01 0.00 33.Nxc4 bxc4 34.Nd5 Qb5 35.Qf3 Qe8
36.Qe2 Qb5 (1.246.295) 692

17/28 0:03 +0.35++ 33.Qg4 (2.243.381) 667
.
.
.
24/48 1:21 +0.74 33.Qg4 h5 34.Qf3 Nc6 35.Nexg6 fxg6
36.e5 Qc7 37.Nxg6 Nxd4 38.cxd4 Bf7
39.Qxh5+ Nh6 40.e6 Qc1+ 41.Kh2 Be8
42.Bd3 Kg7 43.Qe5+ Bf6 44.Qe4 Qc6
45.d5 Qd6+ 46.Kg1 (86.281.148) 1053

25/48 1:31 +0.80++ 33.Qg4 (99.860.445) 1090

25/55 1:43 +0.74-- 33.Qg4 h5 (115.567.709) 1119

25/55 1:56 +0.65-- 33.Qg4 h5 (137.987.977) 1179

25/55 2:10 +0.51-- 33.Qg4 h5 (160.674.590) 1229

25/55 2:13 +0.62++ 33.Qg4 (164.070.643) 1229

25/55 2:15 +0.62 33.Qg4 h5 34.Qf3 Bf6 35.Nexg6 fxg6
36.Nxg6 Bxd4 37.Qxh5+ Kg7 38.cxd4 Qd7
39.Nh4 Bf7 40.Qe5+ Kf8 41.Qb8+ Be8
42.Ng6+ Kg7 43.Ne5 Qe7 44.Nf3 Nc4
45.Qg3+ Kh8 46.e5 (167.040.205) 1230

26/55 2:37 +0.68++ 33.Nxc4 (198.668.022) 1258

26/55 2:45 +0.74++ 33.Nxc4 (209.511.356) 1265
.
.
.
27/62 5:07 +0.83 33.Nxc4 bxc4 34.e5 Bg5 35.Nh5 Qd5
36.Be4 Qd7 37.f4 Nc6 38.fxg5 Nxd4
39.Qd1 hxg5 40.Kf2 Kh6 41.Nf6 Nxf6
42.exf6 g4 43.Qd2+ Kh7 44.hxg4 Qxg4
45.Qxd4 Qf4+ 46.Ke2 (437.529.887) 1423

28/62 5:42 +0.89++ 33.Nxc4 (492.438.270) 1435

28/62 5:48 +0.95++ 33.Nxc4 (500.801.594) 1437

28/62 5:57 +1.05++ 33.Nxc4 (514.637.124) 1439

28/62 6:08 +1.18++ 33.Nxc4 (532.451.316) 1443

28/62 6:12 +1.08-- 33.Nxc4 bxc4 (538.695.520) 1446

28/62 6:17 +1.08 33.Nxc4 bxc4 34.e5 Bg5 35.Nh5 Qd5
36.Be4 Qd7 37.f4 Nc6 38.fxg5 Nxd4
39.Qd1 hxg5 40.Kf2 Kh6 41.Nf6 Nxf6
42.exf6 Qd6 43.Qxd4 Qf4+ 44.Ke2 b2
45.Bb1 Qg3 46.Qd5 (545.651.542) 1443

29/62 6:35 +1.14++ 33.Nxc4 (570.079.478) 1440

29/62 6:57 +1.20++ 33.Nxc4 (604.728.098) 1447

29/62 7:18 +1.14-- 33.Nxc4 bxc4 (638.625.976) 1455

29/62 7:39 +1.22++ 33.Nxc4 (666.935.219) 1451

29/62 8:00 +1.11-- 33.Nxc4 bxc4 (703.138.234) 1464

29/62 8:06 +1.20 33.Nxc4 bxc4 34.e5 Nc6 35.Qxc4 Nxd4
36.Qxd4 Bg5 37.Nh5 Qe7 38.f4 Bh4
39.f5 Bg5 40.h4 Bxh4 41.fxg6+ fxg6
42.Nf4 Qd8 43.Qa7+ Be7 44.Bxg6+ Kh8
45.Bd3 b2 46.Qb7 (712.804.084) 1464

30/62 9:05 +1.21 33.Nxc4 bxc4 34.e5 Nc6 35.Qxc4 Nxd4
36.Qxd4 Bg5 37.Nh5 Qe7 38.f4 Bh4
39.f5 Bg5 40.h4 Bxh4 41.fxg6+ fxg6
42.Nf4 Qd8 43.Qa7+ Be7 44.Bxg6+ Kh8
45.Bd3 b2 46.Qb7 (816.457.019) 1495

31/62 11:38 +1.27++ 33.Nexg6 (1.106.581.521) 1583

31/62 11:57 +1.33++ 33.Nexg6 (1.139.365.891) 1588

31/62 12:36 +1.43++ 33.Nexg6 (1.223.816.351) 1616

31/62 13:23 +1.35-- 33.Nexg6 fxg6 (1.327.915.100) 1652

31/64 14:16 +1.46++ 33.Nexg6 (1.418.856.934) 1656

31/64 14:26 +1.44 33.Nexg6 fxg6 34.Qg4 Ne7 35.e5 Bf7
36.h4 Nac6 37.h5 Nxd4 38.hxg6+ Nxg6
39.Bxg6+ Kh8 40.cxd4 Bg5 41.Bd3 Bc4
42.Bb1 Bxf4 43.Qxf4 Qg7 44.Qe4 Qf7
45.Qh4 Kg7 46.f3 (1.432.357.337) 1652

32/64 15:48 +1.50++ 33.Nexg6 (1.577.025.302) 1661

32/69 16:28 +1.49 33.Nexg6 fxg6 34.Qg4 Ne7 35.e5 Bf7
36.h4 Nac6 37.h5 Nxd4 38.hxg6+ Nxg6
39.Bxg6+ Kh8 40.cxd4 Bg5 41.Bd3 Qc6
42.g3 Bc4 43.d5 Bxd5 44.Nxd5 Qxd5
45.Qf5 Kg8 46.Qg6+ (1.638.099.229) 1657
.
.
.
34/70 23:59 +1.62 33.Nexg6 fxg6 34.Qg4 Ne7 35.e5 Bf7
36.h4 Nac6 37.h5 Nxd4 38.hxg6+ Nxg6
39.Bxg6+ Bxg6 40.Qxg6+ Kh8 41.Qe8+ Kh7
42.cxd4 Bg5 43.Nd3 b4 44.Qa4 Qe4
45.Qxb3 Qxd4 46.Qf7+ (2.424.943.040) 1684

35/71 29:58 +1.68++ 33.Nexg6 (3.147.219.617) 1749

35/77 31:01 +1.62-- 33.Nexg6 fxg6 (3.254.455.848) 1748

35/77 31:32 +1.58 33.Nexg6 fxg6 34.Qg4 Ne7 35.e5 Bf7
36.h4 Nac6 37.h5 Nxd4 38.hxg6+ Nxg6
39.Bxg6+ Kh8 40.cxd4 Bg5 41.Bd3 Qc6
42.g3 Bc4 43.d5 Bxd5 44.Nxd5 Qxd5
45.Qf5 Kg7 46.f4 (3.303.085.270) 1745

36/77 34:58 +1.65++ 33.Nexg6 (3.730.276.155) 1777

36/77 36:32 +1.61 33.Nexg6 fxg6 34.Qg4 Ne7 35.e5 Bf7
36.h4 Nac6 37.h5 Nxd4 38.hxg6+ Nxg6
39.Bxg6+ Kh8 40.cxd4 Bg5 41.Bd3 Qc6
42.g3 Bc4 43.d5 Bxd5 44.Nxd5 Qxd5
45.Qf5 Kg8 46.f4 (3.914.815.637) 1785

37/77 41:44 +1.55-- 33.Nexg6 fxg6 (4.541.466.965) 1813

37/77 43:04 +1.61++ 33.Nexg6 (4.682.483.456) 1811

37/77 46:50 +1.65 33.Nexg6 fxg6 34.Qg4 Ne7 35.e5 Bf7
36.h4 Nac6 37.h5 Nxd4 38.hxg6+ Nxg6
39.Bxg6+ Kh8 40.cxd4 Bg5 41.Bd3 Qc6
42.g3 Bc4 43.d5 Bxd5 44.Nxd5 Qxd5
45.Qf5 Kg8 46.f4 (5.076.557.361) 1806

38/77 64:58 +1.72++ 33.Nexg6 (7.644.106.909) 1960

38/77 69:43 +1.72 33.Nexg6 fxg6 34.Qg4 Ne7 35.e5 Bf7
36.h4 Nac6 37.h5 Nxd4 38.hxg6+ Nxg6
39.Bxg6+ Kh8 40.cxd4 Bg5 41.Bd3 Qc6
42.g3 Bc4 43.d5 Bxd5 44.Nxd5 Qxd5
45.Qf5 Kg8 46.f4 (8.250.554.284) 1971

best move: Ne5xg6 time: 84:05.462 min n/s: 1.971.998 nodes: 10.174.011.514

Eelco de Groot · Post by **Eelco de Groot** » Sun Oct 04, 2015 8:07 pm

MMoisan wrote: 3.Smyslov-Gufeld, Moscow 1967
[D]rnb2r2/3pppkp/p5p1/qPpQ4/P1P1n3/4PN2/4KPPP/RN3B1R b - - 0 12

Gufeld's double piece sacrifice on the twelfth and thirtteenth move is truely spectacular, but apparently only leads to a draw with best play. Can your engine find 12...Nd6!! which yields black the advantage?
Code: Select all
&#91;Event "URS Spartakiad final-A"&#93;
&#91;Site "Moscow"&#93;
&#91;Date "1967.??.??"&#93;
&#91;Round "4.3"&#93;
&#91;White "Smyslov, Vassily"&#93;
&#91;Black "Gufeld, Eduard"&#93;
&#91;Result "0-1"&#93;
&#91;ECO "A15"&#93;
&#91;PlyCount "70"&#93;
&#91;EventDate "1967.07.24"&#93;
&#91;EventType "team-tourn"&#93;

1. c4 Nf6 2. Nf3 g6 3. b4 Bg7 4. Bb2 O-O 5. e3 b6 6. d4 c5 7. dxc5 bxc5 8. b5
a6 9. a4 Ne4 10. Bxg7 Kxg7 11. Qd5 Qa5+ 12. Ke2 Bb7 13. Qxb7 Nc6 14. Nfd2 Ra7
15. bxc6 Rxb7 16. cxb7 Qb4 17. Nxe4 Qb2+ 18. Nbd2 Qxa1 19. Nxc5 Rb8 20. g3 Qa3
21. Nxd7 Rxb7 22. Bh3 Qd6 23. c5 Qd5 24. f3 Rb2 25. Rd1 e6 26. c6 Qc4+ 27. Ke1
Qd3 28. Bf1 Qxe3+ 29. Be2 a5 30. f4 f6 31. c7 Rc2 32. Kf1 Rxc7 33. Nc4 Rxc4 34.
Bxc4 Qf3+ 35. Ke1 Qc3+ 0-1

It seems a very tough nut to crack! Almost 6 billion nodes (American billions). Nice!

rnb2r2/3pppkp/p5p1/qPpQ4/P1P1n3/4PN2/4KPPP/RN3B1R b - -

Engine: Rainbow Serpent Sf20150919_001 MOD MP (512 MB)
by Tord Romstad, Marco Costalba and Joona Kiiski

14/22 0:00 -0.72 12...axb5 13.Qxe4 bxc4 14.Ne5 c3
15.Qc2 f6 16.Nf3 Nc6 17.Nxc3 d6
18.Ke1 Bf5 19.Qd2 Nb4 20.Rc1 Bg4
21.Bb5 d5 (815.157) 1085

15/26 0:03 -0.47 12...axb5 13.Qxe4 bxc4 14.Ne5 c3
15.Qc2 f6 16.Nf3 Nc6 17.Qxc3 Qb6
18.Ke1 d5 19.Bb5 e5 20.h4 d4 21.exd4 (1.648.918) 517
.
.
.
33/56 58:07 -0.39-- 12...axb5 13.Qxe4 (5.286.167.418) 1515

33/56 59:35 -0.33++ 12...axb5 (5.428.717.072) 1518

33/60 62:31 -0.19++ 12...Nd6 (5.748.542.314) 1532

33/60 64:00 +0.01++ 12...Nd6 (5.906.893.825) 1538

33/60 68:24 +0.32++ 12...Nd6 (6.351.332.570) 1547

33/62 85:50 +0.08-- 12...Nd6 13.Ra3 (8.534.275.668) 1656

33/62 96:05 +0.22 12...Nd6 13.Ra3 Bb7 14.Qxc5 Rc8
15.Qd4+ Kg8 16.Nfd2 Nf5 17.Qc3 Qb6
18.Qb2 axb5 19.axb5 d5 20.cxd5 Rxa3
21.Nxa3 Bxd5 22.e4 Nd4+ 23.Kd1 Bb7
24.h4 Qf6 25.f3 Nd7 (9.540.216.878) 1654

34/62 111:44 +0.16-- 12...Nd6 13.Ra3 (10.963.856.546) 1635

34/62 117:50 +0.22++ 12...Nd6 (11.501.578.913) 1626

34/62 118:13 +0.16-- 12...Nd6 13.Ra3 (11.525.270.444) 1624

34/62 130:17 +0.24++ 12...Nd6 (12.505.078.348) 1599

34/62 133:48 +0.27 12...Nd6 13.Ra3 Bb7 14.Qxc5 Rc8
15.Qd4+ Kg8 16.Nfd2 Nf5 17.Qb2 d5
18.cxd5 Bxd5 19.h4 Nd7 20.h5 g5
21.h6 f6 22.Ke1 Be6 23.bxa6 Nc5
24.Qc3 Rxa6 25.Qxa5 Rxa5 (12.756.557.284) 1588

35/62 157:48 +0.21-- 12...Nd6 13.Ra3 (15.188.934.771) 1604

35/62 163:10 +0.15-- 12...Nd6 13.Ra3 (15.737.024.855) 1607

35/62 172:15 +0.21++ 12...Nd6 (16.586.766.554) 1604

35/62 178:11 +0.35++ 12...Nd6 (17.283.779.667) 1616

35/62 188:45 +0.24-- 12...Nd6 13.Ra3 (18.279.161.458) 1613

35/62 197:58 +0.27 12...Nd6 13.Kd1 axb5 14.cxb5 Bb7
15.Qe5+ Kg8 16.Qc3 Ne4 17.Qxa5 Rxa5
18.Rg1 Nxf2+ 19.Ke2 Ne4 20.Nfd2 d6
21.Nb3 Ra7 22.N3d2 Nxd2 23.Nxd2 Nd7
24.a5 Rfa8 25.a6 Bxa6 (19.322.797.072) 1626

best move: Ne4-d6 time: 199:59.799 min n/s: 1.626.725 nodes: 19.544.169.310

kgburcham · Post by **kgburcham** » Sun Oct 04, 2015 10:27 pm

[D] rnb2r2/3pppkp/p5p1/qPpQ4/P1P1n3/4PN2/4KPPP/RN3B1R b - -

8 processor(s) found, POPCNT available
NUMA configuration with 1 node(s), offset 0
8192 MB Hash
Nalimov 6 men EGTB available - 800 MB cache
Engine: Houdini 4 Pro x64 (8192 MB)
by Robert Houdart

26/78 1:16 0.00 12...Bb7 13.Qxb7 Nc6 14.Qxd7 Rfd8 15.Qxc6 Nc3+ 16.Nxc3 Qxc3 17.Rd1 Qxc4+ 18.Ke1 Rxd1+ 19.Kxd1 Qxa4+ 20.Kd2 Qb4+ 21.Kc2 Qa4+ 22.Kc3 Qa3+ 23.Kc2 Qa4+ 24.Kc3 (1.727.240.944) 22704 TB:11
27/81 1:56 0.00 12...Bb7 13.Qxb7 Nc6 14.Qxd7 Rfd8 15.Qxc6 Nc3+ 16.Nxc3 Qxc3 17.Rd1 Qxc4+ 18.Ke1 Rxd1+ 19.Kxd1 Qxa4+ 20.Kd2 Qb4+ 21.Kc2 Qa4+ 22.Kc3 Qa3+ 23.Kc2 Qa4+ 24.Kc3 (2.706.189.068) 23254 TB:48
27/81 2:37 -0.07++ 12...Nd6 (3.671.549.026) 23276 TB:48
27/81 5:18 -0.23++ 12...Nd6 (7.122.614.277) 22345 TB:61
other best move - reduce depth to 24
24/81 6:45 -0.19 12...Nd6 13.Ra3 Bb7 14.Qxc5 Kg8 15.Nfd2 Rc8 16.Qd4 Nf5 17.Qb2 d5 18.cxd5 Nd7 19.Ke1 Nd6 20.f3 Nb6 21.Kf2 Nxd5 22.bxa6 Bxa6 23.Bxa6 Qxa6 24.Rc1 Rxc1 25.Qxc1 Rb8 (9.031.335.964) 22270 TB:61
25/81 6:55 -0.20 12...Nd6 13.Ra3 Bb7 14.Qxc5 Kg8 15.Nfd2 Rc8 16.Qd4 Nf5 17.Qb2 d6 18.h4 Nd7 19.h5 g5 20.Ke1 h6 21.Qc3 Qd8 22.Rg1 Ne5 23.g3 g4 24.Qb2 e6 25.Nc3 Qg5 (9.245.625.950) 22273 TB:61
26/81 7:31 -0.12-- 12...Nd6 13.Ra3 (10.032.472.052) 22213 TB:61
26/81 8:03 -0.28++ 12...Nd6 (10.587.241.470) 21874 TB:61
26/81 8:51 -0.31 12...Nd6 13.Ra3 Qc7 14.Ke1 Bb7 15.Qd2 f6 16.Nc3 Qa5 17.Ra1 Qb4 18.Rb1 Ne4 19.Rxb4 Nxd2 20.Rb2 Nxf3+ 21.gxf3 Bxf3 22.Rg1 d6 23.Be2 Bb7 24.b6 Kf7 25.f4 Nc6 (11.477.966.191) 21588 TB:61
27/81 9:35 -0.23-- 12...Nd6 13.Ra3 (12.347.762.201) 21466 TB:61
27/81 9:47 -0.23 12...Nd6 13.Ra3 Qc7 14.Ke1 Bb7 15.Qd2 f6 16.Qb2 Qa5+ 17.Nfd2 Nf5 18.Bd3 d5 19.cxd5 Nd6 20.Qc3 Qc7 21.e4 axb5 22.axb5 Nd7 23.Be2 Qb6 24.Rxa8 Rxa8 25.Qb3 h5 (12.602.906.521) 21459 TB:61
28/81 10:13 -0.23 12...Nd6 13.Ra3 Qc7 14.Ke1 Bb7 15.Qd2 f6 16.Qb2 Qa5+ 17.Nfd2 Nf5 18.Qc3 Qc7 19.a5 Qd8 20.h4 h5 21.b6 d6 22.Bd3 Bxg2 23.Rh2 Bb7 24.Bxf5 gxf5 25.Qd3 Qd7 (13.162.314.175) 21463 TB:61

[Event "URS Spartakiad final-A"]
[Site "Moscow"]
[Date "1967.??.??"]
[Round "4.3"]
[White "Smyslov, Vassily"]
[Black "Gufeld, Eduard"]
[ECO "A15"]
[Result "0-1"]

1. c4 Nf6 2. Nf3 g6 3. b4 Bg7 4. Bb2 O-O 5. e3 b6 6. d4 c5
7. dxc5 bxc5 8. b5 a6 9. a4 Ne4 10. Bxg7 Kxg7 11. Qd5 Qa5+
12. Ke2 Bb7 13. Qxb7 Nc6 14. Nfd2 Ra7 15. bxc6 Rxb7
16. cxb7 Qb4 17. Nxe4 Qb2+ 18. Nbd2 Qxa1 19. Nxc5 Rb8
20. g3 Qa3 21. Nxd7 Rxb7 22. Bh3 Qd6 23. c5 Qd5 24. f3 Rb2
25. Rd1 e6 26. c6 Qc4+ 27. Ke1 Qd3 28. Bf1 Qxe3+ 29. Be2 a5
30. f4 f6 31. c7 Rc2 32. Kf1 Rxc7 33. Nc4 Rxc4 34. Bxc4
Qf3+ 35. Ke1 Qc3+ 0-1

Vinvin · Post by **Vinvin** » Sun Oct 04, 2015 11:33 pm

MMoisan wrote: 3.Smyslov-Gufeld, Moscow 1967
[D]rnb2r2/3pppkp/p5p1/qPpQ4/P1P1n3/4PN2/4KPPP/RN3B1R b - - 0 12

Gufeld's double piece sacrifice on the twelfth and thirtteenth move is truely spectacular, but apparently only leads to a draw with best play. Can your engine find 12...Nd6!! which yields black the advantage?

Very long analysis from SF (I forgot it was running in background).
Nd6 found after 1m16s.
I7-4930K, 6*4.4 GHz.

Code: Select all

Stockfish_15100312_x64_modern&#58;
...
 27/46+	00&#58;14	 132.106k	9.101k	+0,71	12. ... axb5 13.Qxe4
 27/46-	00&#58;14	 132.991k	9.107k	+0,65	12. ... axb5
 27/46	00&#58;14	 135.116k	9.099k	+0,65	12. ... axb5 13.Qxe4 bxc4 14.Nfd2 e6 15.Nxc4 Qa6 16.Ke1 d5 17.Qe5+ f6 18.Qc7+ Rf7 19.Nd6 Rxc7 20.Bxa6 Nxa6 21.Ne8+ Kf7 22.Nxc7 Nxc7 23.Nc3 Ne8 24.Nb5 Bd7 25.Kd2 Ra5 26.Rhb1 e5 27.f3 d4 28.Ke2 Ke6 29.exd4 exd4 30.Kd2 Kf7
 28/46	00&#58;19	 179.516k	9.222k	+0,66	12. ... axb5 13.Qxe4 bxc4 14.Nfd2 e6 15.Nxc4 Qa6 16.Ke1 d5 17.Qe5+ f6 18.Qc7+ Rf7 19.Nd6 Rxc7 20.Bxa6 Nxa6 21.Ne8+ Kf7 22.Nxc7 Nxc7 23.Nc3 Ne8 24.Nb5 Bd7 25.Kd2 Ra5 26.Rhb1 e5 27.Nc3 d4 28.Nb5 f5 29.exd4 cxd4 30.f3 Be6 31.Kd3 f4 32.Rb2 Bf5+ 33.Kc4
 29/49+	00&#58;24	 229.680k	9.358k	+0,72	12. ... axb5 13.Qxe4
 29/49-	00&#58;30	 285.560k	9.443k	+0,66	12. ... Bb7
 29/49-	00&#58;31	 295.290k	9.472k	+0,43	12. ... Bb7
 29/49	00&#58;32	 307.214k	9.489k	+0,32	12. ... Bb7 13.Qxb7 Nc6 14.bxc6 Rab8 15.Nfd2 Rxb7 16.cxb7 Nd6 17.g3 Nxb7 18.Bg2 Nd6 19.Kd3 Rb8 20.Nc3 Rb4 21.Rhb1 e6 22.Nce4 Nc8 23.Kc2 Rxa4 24.Rxa4 Qxa4+ 25.Kd3 Qc6 26.Bf3 f5 27.Nc3 Qd6+ 28.Ke2 Nb6
 30/49-	00&#58;35	 338.894k	9.564k	+0,26	12. ... Bb7
 30/49-	00&#58;36	 348.906k	9.580k	+0,20	12. ... Bb7
 30/49-	00&#58;37	 364.639k	9.610k	+0,11	12. ... Bb7
 30/49+	00&#58;40	 385.854k	9.625k	+0,18	12. ... Bb7 13.Qxb7
 30/49-	00&#58;41	 399.513k	9.653k	+0,08	12. ... Bb7
 30/49	00&#58;42	 413.170k	9.670k	+0,05	12. ... Bb7 13.Qxb7 Nc6 14.bxc6 Rab8 15.Nfd2 Rxb7 16.cxb7 Qb4 17.Ra2 Nd6 18.Ra3 Rb8 19.g3 Qxb7 20.Rb3 Qxh1 21.Rxb8 Qxh2 22.Ke1 Qh1 23.Nc3 Qc6 24.a5 Nb7 25.Nd5 e6 26.Rg8+ Kh6 27.Nf6 Qa4 28.Ng4+ Kg5 29.Be2 Qa1+ 30.Bd1 d5 31.f4+ Kf5 32.e4+ dxe4 33.Ne3+ Kf6 34.Kf2
 31/51+	00&#58;46	 450.868k	9.700k	+0,11	12. ... Bb7 13.Qxb7
 31/51	00&#58;48	 474.110k	9.730k	+0,11	12. ... Bb7 13.Qxb7 Nc6 14.bxc6 Rab8 15.Nfd2 Rxb7 16.cxb7 Qb4 17.Ra2 Nd6 18.Ke1 Nxb7 19.Bd3 Na5 20.Ke2 d5 21.Na3 d4 22.Nb5 axb5 23.Rb1 bxc4 24.Rxb4 cxd3+ 25.Kxd3 cxb4 26.exd4 Rc8 27.Rc2 Rxc2 28.Kxc2 Kf6 29.Kd3 e6 30.Nc4 Nc6 31.a5 Ke7
 32/51	00&#58;55	 544.371k	9.816k	+0,09	12. ... Bb7 13.Qxb7 Nc6 14.bxc6 Rab8 15.Nfd2 Rxb7 16.cxb7 Qb4 17.Ra2 Nd6 18.Ke1 e6 19.Bd3 Nxb7 20.Ke2 d5 21.Rc1 d4 22.Rcc2 Qa5 23.Nb3 Qc7 24.exd4 cxd4 25.N1d2 Nd8 26.Rc1 Nc6 27.Nf3 Rb8 28.Rb1 Nb4 29.Rd2 e5 30.c5
 33/51-	01&#58;03	 630.428k	9.878k	+0,03	12. ... Bb7
 33/51-	01&#58;16	 754.082k	9.896k	-0,02	12. ... Nd6
 33/51-	01&#58;26	 852.079k	9.904k	-0,25	12. ... Nd6
 33/51+	01&#58;46	 1.053.951k	9.914k	-0,15	12. ... Nd6 13.Kd1
 33/51	01&#58;56	 1.152.504k	9.888k	 0,00	12. ... Nd6 13.Kd1 Bb7 14.Qe5+ Kg8 15.Qc3 axb5 16.cxb5 Ne4 17.Qxa5 Rxa5 18.Rg1 d5 19.Nfd2 Nxd2 20.Nxd2 c4 21.e4 e6 22.Bxc4 dxc4 23.Nxc4 Ra7 24.f3 f5 25.exf5 Rxf5 26.Ke2 Nd7 27.Rgb1 Rc5 28.Nd2 Re5+ 29.Kf2 Rd5 30.Ke2 Re5+
 34/51-	02&#58;02	 1.206.243k	9.879k	-0,06	12. ... Nd6
 34/51-	02&#58;07	 1.261.472k	9.875k	-0,12	12. ... Nd6
 34/51-	02&#58;11	 1.301.518k	9.867k	-0,21	12. ... Nd6
 34/51+	02&#58;22	 1.403.432k	9.859k	-0,13	12. ... Nd6 13.Kd1
 34/51	02&#58;29	 1.474.256k	9.844k	-0,07	12. ... Nd6 13.Kd1 Bb7 14.Qe5+ Kg8 15.Qc3 axb5 16.cxb5 Ne4 17.Qxa5 Rxa5 18.Rg1 Nxf2+ 19.Ke2 Ne4 20.Nfd2 d6 21.Nc4 Ra7 22.a5 d5 23.Ncd2 Nd6 24.Kf2 e5 25.a6 f5 26.g3 d4 27.Bc4+ Kg7 28.Ra3 Nd7 29.axb7 Rxb7 30.Kg2 Nxc4 31.Nxc4 Rxb5 32.Nbd2 dxe3 33.Rxe3
 35/54-	02&#58;40	 1.577.587k	9.837k	-0,13	12. ... Nd6
 35/54-	02&#58;46	 1.636.827k	9.839k	-0,20	12. ... Nd6
 35/54+	02&#58;51	 1.682.914k	9.837k	-0,13	12. ... Nd6 13.Kd1
 35/54-	02&#58;58	 1.760.766k	9.843k	-0,21	12. ... Nd6
 35/56	03&#58;10	 1.871.054k	9.829k	-0,20	12. ... Nd6 13.Kd1 Bb7 14.Qe5+ Kg8 15.Qc3 axb5 16.cxb5 Ne4 17.Qxa5 Rxa5 18.Rg1 Nxf2+ 19.Ke2 Ne4 20.Nfd2 d6 21.Nb3 Ra7 22.N3d2 Nxd2 23.Nxd2 Nd7 24.a5 Rfa8 25.a6 Bxa6 26.bxa6 Rxa6 27.Rxa6 Rxa6 28.e4 Ne5 29.Ke3 Ra1 30.Nf3 Ng4+ 31.Kf4 h5 32.Be2 Ra2 33.Re1 Rb2 34.h3 e5+ 35.Kg5 Ne3 36.g4 hxg4
 36/59-	03&#58;26	 2.029.090k	9.830k	-0,26	12. ... Nd6
 36/59	03&#58;44	 2.202.763k	9.828k	-0,26	12. ... Nd6 13.Kd1 Bb7 14.Qe5+ Kg8 15.Qc3 axb5 16.cxb5 Ne4 17.Qxa5 Rxa5 18.Rg1 Nxf2+ 19.Ke2 Ne4 20.Nfd2 d6 21.Nc4 Ra7 22.Ncd2 Nxd2 23.Nxd2 Nd7 24.a5 Rfa8 25.a6 Bxa6 26.bxa6 Rxa6 27.Rxa6 Rxa6 28.e4 Ne5 29.Ke3 Ra1 30.h3 e6 31.Nf3 Nxf3 32.gxf3 Kg7 33.Kf2 Kf6 34.Bd3 Rxg1 35.Kxg1 Ke5
 37/59-	04&#58;27	 2.628.806k	9.833k	-0,32	12. ... Nd6
 37/59	05&#58;19	 3.152.208k	9.859k	-0,34	12. ... Nd6 13.Kd1 Bb7 14.Qe5+ Kg8 15.Qc3 axb5 16.cxb5 Ne4 17.Qxa5 Rxa5 18.Rg1 d5 19.Nfd2 Nxd2 20.Nxd2 c4 21.Bxc4 dxc4 22.Nxc4 Ra7 23.Ke2 Rc8 24.Nd2 Nd7 25.a5 Rc2 26.Rgc1 Rb2 27.a6 Bxg2 28.Rab1 Rxb1 29.Nxb1 Kg7 30.f3 Kf6 31.Nc3 Ke5 32.Rd1 Nb6 33.Kf2 Bh3 34.f4+ Ke6
 38/59+	05&#58;47	 3.426.914k	9.863k	-0,27	12. ... Nd6 13.Kd1
 38/59	06&#58;28	 3.840.767k	9.877k	-0,30	12. ... Nd6 13.Kd1 Bb7 14.Qe5+ Kg8 15.Qc3 axb5 16.cxb5 Ne4 17.Qxa5 Rxa5 18.Rg1 d5 19.Nfd2 Nxd2 20.Nxd2 c4 21.Bxc4 dxc4 22.Nxc4 Ra7 23.Nb6 Be4 24.Ke2 Nd7 25.Nxd7 Rxd7 26.f3 Bd3+ 27.Kf2 f6 28.Rgc1 Rb8 29.e4 f5 30.exf5 Bxf5 31.g4 Be6 32.Rd1 Rxd1 33.Rxd1 Kf7 34.Ke3 g5 35.Ra1 Bb3
 39/59+	06&#58;59	 4.137.300k	9.870k	-0,24	12. ... Nd6 13.Kd1
 39/59+	12&#58;24	 7.258.507k	9.745k	-0,17	12. ... Nd6 13.Ra3
 39/59-	13&#58;30	 7.881.428k	9.730k	-0,24	12. ... Nd6
 39/59+	17&#58;54	 10.429.073k	9.705k	-0,16	12. ... Nd6 13.Ra3
 39/59	20&#58;41	 12.037.386k	9.695k	-0,13	12. ... Nd6 13.Ra3 Qb4 14.Nfd2 Bb7 15.Qd3 Nf5 16.Rb3 Qa5 17.Qc3+ Qxc3 18.Rxc3 d5 19.cxd5 axb5 20.axb5 Nd7 21.Rc1 Bxd5 22.f3 Be6 23.Kf2 Nd6 24.Be2 Rfb8 25.Nc3 c4 26.Ra1 Rxa1 27.Rxa1 Nxb5 28.Nxb5 Rxb5 29.Nxc4 Bxc4 30.Bxc4 Rb2+ 31.Kg3 Ne5 32.Bf1 Kf6 33.Ra6+ e6 34.Ra7 h5
 40/60+	25&#58;56	 15.165.238k	9.741k	-0,07	12. ... Nd6 13.Ra3
 40/60	27&#58;32	 16.102.617k	9.747k	-0,08	12. ... Nd6 13.Ra3 Qb4 14.Nfd2 Bb7 15.Qd3 Nf5 16.Rb3 Qa5 17.Qc3+ Qxc3 18.Rxc3 axb5 19.axb5 d5 20.cxd5 Nd7 21.Rc2 Bxd5 22.f3 Nd6 23.Kf2 Ra1 24.Nc3 Be6 25.Rg1 Ra3 26.Be2 f5 27.Rb1 Rb8 28.e4 c4 29.Rb4 Ne5 30.b6 Ra1 31.Ra4 Nd3+ 32.Bxd3 cxd3 33.Rb2 Rc1 34.e5
 41/65-	36&#58;05	 21.162.421k	9.773k	-0,14	12. ... Nd6
 41/65+	39&#58;41	 23.277.490k	9.776k	-0,08	12. ... Nd6 13.Ra3
 41/65-	40&#58;22	 23.670.432k	9.771k	-0,14	12. ... Nd6
 41/68	42&#58;17	 24.755.970k	9.756k	-0,09	12. ... Nd6 13.Ra3 Bb7 14.Qxc5 Rc8 15.Qd4+ Kg8 16.Nfd2 Nf5 17.Qc3 Qb6 18.e4 Nd4+ 19.Kd1 Qf6 20.Qe3 axb5 21.axb5 Rxa3 22.Qxa3 Qxf2 23.Qxe7 f5 24.Nc3 Qe3 25.c5 Qxc3 26.Bc4+ Ne6 27.exf5 gxf5 28.Bxe6+ dxe6 29.Qxe6+ Kh8 30.Re1 Qa1+ 31.Ke2 Qg7 32.Kd1 Rxc5 33.Qe8+ Qg8 34.Re7 Bc8 35.Rxh7+ Kxh7 36.Qe7+ Qg7 37.Qxc5 Bd7 38.g3 Qa1+ 39.Ke2 Qb2 40.Qe7+ Kg8 41.Qg5+ Kf7 42.Qh5+ Ke7 43.Qg5+ Kd6 44.Qf4+ Qe5+ 45.Kf3 Qxf4+ 46.Kxf4
 42/73+	53&#58;42	 31.191.005k	9.678k	-0,03	12. ... Nd6 13.Ra3
 42/73	56&#58;45	 32.980.905k	9.684k	-0,04	12. ... Nd6 13.Ra3 Bb7 14.Qxc5 Rc8 15.Qd4+ f6 16.Nfd2 Nf5 17.Qc3 Qb6 18.e4 Nd4+ 19.Kd1 axb5 20.axb5 d6 21.Rxa8 Bxa8 22.h4 Nd7 23.h5 g5 24.h6+ Kf7 25.Be2 e6 26.Na3 Nxb5 27.Nxb5 Qxb5 28.cxb5 Rxc3 29.Rh3 Rxh3 30.gxh3 d5 31.exd5 Bxd5 32.Kc2 Ke7 33.Nc4 f5 34.Kc3 Bxc4 35.Bxc4 Kd6 36.Be2 e5
 43/73-	1&#58;01&#58;38	 35.904.399k	9.709k	-0,10	12. ... Nd6
 43/73+	1&#58;05&#58;59	 38.516.783k	9.729k	-0,04	12. ... Nd6 13.Ra3
 43/73-	1&#58;06&#58;41	 38.923.314k	9.728k	-0,10	12. ... Nd6
 43/73	1&#58;11&#58;26	 41.896.799k	9.774k	-0,10	12. ... Nd6 13.Ra3 Bb7 14.Qxc5 Rc8 15.Qd4+ f6 16.Nfd2 Nf5 17.Qc3 Qb6 18.e4 Nd4+ 19.Kd1 axb5 20.axb5 d6 21.Rxa8 Bxa8 22.Na3 Nd7 23.Qe3 Bb7 24.Nc2 e5 25.h4 Ra8 26.Bd3 h6 27.Nf3 Nxc2 28.Qxb6 Nxb6 29.Kxc2 Ra2+ 30.Kc3 Ra3+ 31.Kd2 f5 32.c5 fxe4 33.cxb6 Rxd3+ 34.Ke2 Rb3 35.Nd2 Rxb5 36.Rb1 Rxb1 37.Nxb1 d5 38.Nd2
 44/73+	1&#58;22&#58;47	 48.735.841k	9.810k	-0,04	12. ... Nd6 13.Ra3
 44/73	1&#58;29&#58;11	 52.475.689k	9.806k	-0,09	12. ... Nd6 13.Ra3 Bb7 14.Qxc5 Rc8 15.Qd4+ Kg8 16.Nfd2 Nf5 17.Qc3 Qb6 18.e4 Nd4+ 19.Kd1 Qf6 20.Qe3 axb5 21.axb5 Rxa3 22.Qxa3 Qxf2 23.Qxe7 f5 24.Nc3 Qe3 25.c5 Qxc3 26.Bc4+ Ne6 27.exf5 gxf5 28.Bxe6+ dxe6 29.Qxe6+ Kh8 30.Re1 Qa1+ 31.Ke2 Qg7 32.Qd6 Bxg2 33.Kf2 Be4 34.Nxe4 fxe4 35.Rxe4 Nd7 36.c6 Nf6 37.Re7 Qg6 38.Qe5 Rf8 39.Kf3 Qd3+ 40.Kf2 Qd2+ 41.Kg3 Rg8+ 42.Kf3 Qd3+ 43.Kf4
 45/73	1&#58;46&#58;21	 62.771.120k	9.836k	-0,08	12. ... Nd6 13.Ra3 Bb7 14.Qxc5 Rc8 15.Qd4+ Kg8 16.Nfd2 Nf5 17.Qc3 Qb6 18.e4 Nd4+ 19.Kd1 Qf6 20.Qe3 axb5 21.axb5 Rxa3 22.Qxa3 Qxf2 23.Qxe7 f5 24.Nc3 Qe3 25.c5 Qxc3 26.Bc4+ Ne6 27.exf5 gxf5 28.Bxe6+ dxe6 29.Qxe6+ Kh8 30.Re1 Qa1+ 31.Ke2 Qg7 32.Kd1 Rxc5 33.Qe8+ Qg8 34.Qxg8+ Kxg8 35.Re8+ Kf7 36.Rxb8 Rxb5 37.Ke1 Re5+ 38.Kf2 Bxg2 39.Kxg2 Re2+ 40.Kf3 Rxd2 41.Ke3 Rd6 42.Kf4 Rf6 43.Kg5 h6+ 44.Kf4 Kg6 45.Rg8+ Kh5 46.Rb8 Rf7 47.Rb6
 46/74+	2&#58;06&#58;14	 74.747.190k	9.869k	-0,02	12. ... Nd6 13.Ra3
 46/74	2&#58;20&#58;17	 83.204.842k	9.885k	-0,03	12. ... Nd6 13.Ra3 Bb7 14.Qxc5 Rc8 15.Qd4+ f6 16.Nfd2 Nf5 17.Qc3 Qb6 18.e4 Nd4+ 19.Kd1 axb5 20.axb5 d6 21.Rxa8 Bxa8 22.Qe3 Nd7 23.Na3 e5 24.Nc2 Bb7 25.h4 Ra8 26.Bd3 Ra2 27.h5 Nxc2 28.Bxc2 Ra1+ 29.Bb1 Qxe3 30.fxe3 Bxe4 31.Kc1 Bxg2 32.Rg1 Bb7 33.Kb2 Ra4 34.Bc2 Ra8 35.hxg6 h5 36.Be4 d5 37.Bxd5 Bxd5 38.cxd5 Ra5 39.e4 Rxb5+ 40.Kc3 Rb8 41.Nc4 Nc5 42.Nd2 Ra8
 47/74-	2&#58;36&#58;11	 93.030.465k	9.927k	-0,09	12. ... Nd6
 47/74+	2&#58;49&#58;11	101.100.751k	9.960k	-0,03	12. ... Nd6 13.Ra3
 47/74-	3&#58;06&#58;00	110.964.538k	9.943k	-0,09	12. ... Nd6
 47/74	3&#58;27&#58;40	124.063.044k	9.956k	-0,08	12. ... Nd6 13.Ra3 Qb4 14.Nfd2 Bb7 15.Qd3 Nf5 16.f3 d5 17.cxd5 Kg8 18.Kf2 axb5 19.g4 Nd6 20.axb5 Nd7 21.Rb3 Qa5 22.Qc3 Bxd5 23.Qxa5 Rxa5 24.Rb2 Ne5 25.Rg1 f5 26.gxf5 Rxf5 27.f4 Bb7 28.Nc3 Kg7 29.Rc2 Ra3 30.b6 Nf3 31.Nxf3 Rxc3 32.Rxc3 Ne4+ 33.Ke1 Nxc3 34.Ne5 Rf6 35.Nd7 Rd6 36.Nxc5 Rxb6 37.Bd3 Nd5 38.Nxb7 Rxb7
 48/74-	4&#58;13&#58;20	151.851.625k	9.990k	-0,14	12. ... Nd6
 48/74	5&#58;10&#58;59	187.000.007k	10.021k	-0,13	12. ... Nd6 13.Ra3 Qb4 14.Nfd2 Bb7 15.Qd3 Nf5 16.f3 d5 17.cxd5 Kg8 18.Kf2 axb5 19.axb5 Qh4+ 20.Kg1 Nd7 21.g3 Qf6 22.e4 Nd4 23.Kg2 e6 24.dxe6 Qxe6 25.Rxa8 Rxa8 26.Qc3 Ne5 27.Bc4 Nxc4 28.Qxc4 Qxc4 29.Nxc4 Ra2+ 30.Nbd2 f5 31.Kh3 fxe4 32.fxe4 Nxb5 33.Rb1 Ba6 34.Rb2 Rxb2 35.Nxb2 Nd4 36.Kg4 Ne6 37.Nbc4 Kf7 38.Kf3 Nd4+ 39.Kf4 Ke6 40.g4 Bxc4 41.Nxc4

Joerg Oster · Post by **Joerg Oster** » Sun Oct 04, 2015 11:37 pm

Same position, latest SF with LazySMP, 512 MB Hash, 6 threads, needs 3:35 to find Nd6.
Interestingly, it first switched to Bb7.

Code: Select all

info depth 30 seldepth 56 multipv 1 score cp -69 lowerbound nodes 839771563 nps 8176380 hashfull 999 tbhits 0 time 102707 pv a6b5
info depth 30 currmove a6b5 currmovenumber 1
info depth 30 currmove e4c3 currmovenumber 2
info depth 30 currmove a5c3 currmovenumber 3
info depth 30 currmove d7d6 currmovenumber 4
info depth 30 currmove a5b4 currmovenumber 5
info depth 30 currmove a5b6 currmovenumber 6
info depth 30 currmove a5d2 currmovenumber 7
info depth 30 currmove b8c6 currmovenumber 8
info depth 30 currmove c8b7 currmovenumber 9
info depth 30 seldepth 56 multipv 1 score cp -60 lowerbound nodes 1276492181 nps 8236549 hashfull 999 tbhits 0 time 154979 pv c8b7
info depth 30 currmove c8b7 currmovenumber 1
info depth 30 seldepth 56 multipv 1 score cp -46 lowerbound nodes 1321263537 nps 8242031 hashfull 999 tbhits 0 time 160308 pv c8b7
info depth 30 currmove c8b7 currmovenumber 1
info depth 30 seldepth 56 multipv 1 score cp -25 lowerbound nodes 1421141432 nps 8274380 hashfull 999 tbhits 0 time 171752 pv c8b7
info depth 30 currmove c8b7 currmovenumber 1
info depth 30 currmove a6b5 currmovenumber 2
info depth 30 currmove e4c3 currmovenumber 3
info depth 30 currmove b8c6 currmovenumber 4
info depth 30 currmove a5b4 currmovenumber 5
info depth 30 currmove e4d6 currmovenumber 6
info depth 30 seldepth 56 multipv 1 score cp 6 lowerbound nodes 1788335385 nps 8330625 hashfull 999 tbhits 0 time 214670 pv e4d6
info depth 30 currmove e4d6 currmovenumber 1
info depth 30 currmove a6b5 currmovenumber 2
info depth 30 currmove c8b7 currmovenumber 3
info depth 30 currmove g7g8 currmovenumber 4
info depth 30 currmove d7d6 currmovenumber 5
info depth 30 currmove a5b4 currmovenumber 6
info depth 30 currmove e4c3 currmovenumber 7
info depth 30 currmove b8c6 currmovenumber 8
info depth 30 currmove f7f6 currmovenumber 9
info depth 30 currmove a5c7 currmovenumber 10
info depth 30 currmove e7e5 currmovenumber 11
info depth 30 currmove a5c3 currmovenumber 12
info depth 30 currmove e7e6 currmovenumber 13
info depth 30 currmove a5d8 currmovenumber 14
info depth 30 currmove g7f6 currmovenumber 15
info depth 30 currmove e4g3 currmovenumber 16
info depth 30 currmove f8d8 currmovenumber 17
info depth 30 currmove e4f6 currmovenumber 18
info depth 30 currmove f8e8 currmovenumber 19
info depth 30 currmove a5d2 currmovenumber 20
info depth 30 currmove e4g5 currmovenumber 21
info depth 30 currmove a8a7 currmovenumber 22
info depth 30 currmove f7f5 currmovenumber 23
info depth 30 currmove e4d2 currmovenumber 24
info depth 30 currmove h7h6 currmovenumber 25
info depth 30 currmove g6g5 currmovenumber 26
info depth 30 currmove a5b6 currmovenumber 27
info depth 30 currmove a5e1 currmovenumber 28
info depth 30 currmove h7h5 currmovenumber 29
info depth 30 currmove f8h8 currmovenumber 30
info depth 30 currmove g7h8 currmovenumber 31
info depth 30 currmove f8g8 currmovenumber 32
info depth 30 currmove g7h6 currmovenumber 33
info depth 30 currmove a5b5 currmovenumber 34
info depth 30 currmove a5a4 currmovenumber 35
info depth 30 currmove e4f2 currmovenumber 36
info depth 30 seldepth 56 multipv 1 score cp 13 nodes 2680530265 nps 8312108 hashfull 999 tbhits 0 time 322485 pv e4d6 e2d1 a6b5 d5e5 g7g8 c4b5 c5c4 f3d2 d6b5 f1c4 b5d6 e5a5 a8a5 c4b5 c8b7 d2b3 a5a7 f2f3 b7d5 b1d2 b8c6 d1e2 d5b3 d2b3 f8b8 h1d1 d6b5 a4b5 a7a1 b3a1 b8b5 d1d7 g8f8 d7c7 b5b2 e2d3 c6b4 d3c4

MikeB · Post by **MikeB** » Wed Oct 07, 2015 5:08 am

latest stockfish running on 5 year old mac pro

Code: Select all

info depth 29 seldepth 43 multipv 1 score cp -69 nodes 376928139 nps 10197168 hashfull 929 tbhits 0 time 36964 pv a6b5 d5e4 b5c4 f3d2 a5b4 e2d1 a8a4 f1c4 b8c6 a1a4 b4a4 c4b3 a4b4 e4b4 c6b4 b1c3 c8b7 d2f3 f7f6 d1e2 f8a8 h1b1 d7d6 e3e4 b7a6 e2e3 a6d3 b1b2 a8a3 f3e1 d3a6 f2f3 a3a1 b2b1 a1b1
info depth 30 currmove a6b5 currmovenumber 1
info depth 30 currmove a5c3 currmovenumber 2
info depth 30 seldepth 44 multipv 1 score cp -63 lowerbound nodes 470716994 nps 11073609 hashfull 962 tbhits 0 time 42508 pv e4d6
info depth 30 currmove e4d6 currmovenumber 1
info depth 30 seldepth 44 multipv 1 score cp -57 lowerbound nodes 473951435 nps 11067425 hashfull 963 tbhits 0 time 42824 pv e4d6
info depth 30 currmove e4d6 currmovenumber 1
info depth 30 seldepth 44 multipv 1 score cp -48 lowerbound nodes 477934316 nps 11069187 hashfull 966 tbhits 0 time 43177 pv e4d6
info depth 30 currmove e4d6 currmovenumber 1
info depth 30 seldepth 44 multipv 1 score cp -34 lowerbound nodes 483502834 nps 11045181 hashfull 969 tbhits 0 time 43775 pv e4d6
info depth 30 currmove e4d6 currmovenumber 1
info depth 30 seldepth 44 multipv 1 score cp -13 lowerbound nodes 490371665 nps 11078340 hashfull 970 tbhits 0 time 44264 pv e4d6
info depth 30 currmove e4d6 currmovenumber 1
info depth 30 seldepth 44 multipv 1 score cp 18 lowerbound nodes 529098444 nps 11342847 hashfull 975 tbhits 0 time 46646 pv e4d6
info depth 30 currmove e4d6 currmovenumber 1
info depth 30 currmove a6b5 currmovenumber 2
info depth 30 currmove a5b4 currmovenumber 4
info depth 30 seldepth 52 multipv 1 score cp 2 nodes 853042476 nps 13380009 hashfull 996 tbhits 0 time 63755 pv e4d6 e2d1 c8b7 d5e5 g7g8 e5c3 a6b5 c3a5 a8a5 c4b5 d6e4 h1g1 e4f2 d1e2 f2e4 f3d2 d7d6 d2c4 a5a7 a4a5 d6d5 c4d2 e4d6 e2f2 f7f5 g2g3 e7e5 a5a6 c5c4 b1c3 b7a6 b5a6 d6e4 d2e4 f5e4 f2e2 a7a6 a1a6

Vinvin · Post by **Vinvin** » Thu Aug 15, 2019 10:44 pm

Position 1 is too easy.

For position 2, there's a better move but it's hard to find : Nexg6!
3b2n1/1q3p1k/6pp/np2N3/2bBPN2/1pP4P/4QPP1/1B4K1 w - - 0 33

Position 3 still interesting :
rnb2r2/3pppkp/p5p1/qPpQ4/P1P1n3/4PN2/4KPPP/RN3B1R w - - 0 12

Code: Select all

Stockfish_19081422_x64_modern:
Found 511 tablebases
...
 34/54+	01:23	 593 439 102	7 149 265	-0,55	11. ... axb5
 34/56+	01:29	 640 577 583	7 160 011	-0,26	11. ... Nd6
 34/56+	02:03	 883 920 745	7 142 447	+0,62	11. ... Nd6
 34/60	02:10	 932 374 431	7 138 669	+0,23	11. ... Nd6 12.Ra3 Bb7 13.Qxc5 Rc8 14.Qd4+ Kg8 15.Nfd2 Nf5 16.Qc3 Qb6 17.h4 d5 18.h5 Nd7 19.Ke1 d4 20.exd4 Nxd4 21.hxg6 fxg6 22.Qh3 Nf6 23.Bd3 Qd6 24.Qg3 Qxg3 25.fxg3 axb5 26.axb5 Nxb5 27.Rxa8 Bxa8 28.Rh4 Nd6 29.Kf2 Nd7 30.Nf3 Nc5 31.Bc2 Bxf3
 35/48+	02:12	 947 199 774	7 141 132	+0,33	11. ... Nd6
 35/51-	02:21	1 014 719 771	7 154 479	+0,12	11. ... Nd6 12.Ra3
 35/51	02:49	1 218 889 228	7 208 139	+0,12	11. ... Nd6 12.Ra3 Bb7 13.Qxc5 f6 14.Nfd2 Rc8 15.Qd4 Nf5 16.Qd3 d5 17.c5 Qb4 18.c6 Nxc6 19.bxc6 Bxc6 20.Qb3 Qd6 21.g4 Rab8 22.Qd3 Nh4 23.f3 d4 24.Qxd4 Rxb1 25.Qxd6 exd6 26.Nxb1 Bxf3+ 27.Kf2 Bxh1 28.Rc3 Rxc3 29.Nxc3 Bb7 30.Ne2 g5 31.Nd4 Bc8 32.Nf5+ Bxf5 33.gxf5 Nxf5 34.Bxa6 d5 35.Bd3 Nd6
 36/46+	02:55	1 261 846 196	7 205 814	+0,23	11. ... Nd6
 36/46+	02:55	1 266 399 072	7 201 750	+0,34	11. ... Nd6
 36/57+	02:56	1 273 480 935	7 201 928	+0,49	11. ... Nd6
 36/57	02:59	1 289 853 504	7 198 365	+0,53	11. ... Nd6 12.Ra3 Bb7 13.Qxc5 Rc8 14.Qd4+ f6 15.Nfd2 Nf5 16.Qd3 Qb6 17.Nb3 Qe6 18.f3 Rxc4 19.Kf2 d5 20.Be2 Nd7 21.Nd4 Nxd4 22.exd4 Rb4 23.Qe3 Qd6 24.Rb3 Rxa4 25.Nc3 Ra5 26.Rhb1 e5 27.bxa6 Bxa6 28.Bxa6 Qxa6 29.dxe5 fxe5 30.Rb7 Qe6 31.Qb6 Qxb6+ 32.R1xb6 R8a7 33.Rb5 d4 34.Ne4 Ra2+ 35.Kg1 Ra1+ 36.Kf2 Kh6
 37/57-	03:09	1 361 698 440	7 184 189	+0,42	11. ... Nd6 12.Ra3

Three Test positions from Larsen, Euwe and Gufeld!

Three Test positions from Larsen, Euwe and Gufeld!

Re: Three Test positions from Larsen, Euwe and Gufeld!

Re: Three Test positions from Larsen, Euwe and Gufeld!

Re: Three Test positions from Larsen, Euwe and Gufeld!

Re: Three Test positions from Larsen, Euwe and Gufeld!

Re: Three Test positions from Larsen, Euwe and Gufeld!

Re: Three Test positions from Larsen, Euwe and Gufeld!

Re: Three Test positions from Larsen, Euwe and Gufeld!

Re: Three Test positions from Larsen, Euwe and Gufeld!

Re: Three Test positions from Larsen, Euwe and Gufeld!