Test Positions

on Sat Jun 20, 2015 8:47 pm by · on Sat Jun 20, 2015 8:47 pm by

[fen]4K3/2k1Bp1N/6p1/5PP1/8/7p/b7/8 w - - 0 0[/fen]

1. Bf6 Kd6 2. Be7+ Kc6 3. f6 h2 4. Bf8 h1=Q 5. Bh6*

The queen cannot deliver a check from a8, and the white king comes to g7 safely. White has successfully built an impregnable fortress.

Analysis by Stockfish 170615 64 BMI2:

-+ (-6.70) Depth: 90/96 00:00:21 353MN, tb=2627521

Don't the engine understand that that white has barricaded himself in an unbreakable fortress think

[fen]8/kp4K1/1N6/1P6/8/6N1/1p6/8 w - - 0 0[/fen]
Imprisoned King

1. Nd5 b1=Q 2. b6+ Kb8 3. Nh5 Qb5 4. Nhf6 * Komodo 9.02 -+ (-2.05) Depth: 43 00:00:12 468MN, tb=5990679

1. Nd5 b1=Q 2. b6+ Ka6 3. Ne2 Qa1 4. Nec3 * Komodo 9.02 -+ (-2.21) Depth: 39 00:00:08 312MN, tb=18545296

[fen]4k3/5ppp/8/8/8/8/PPP5/3K4 w - - 0 1[/fen]

Szén Position

Analysis by Komodo 9.1 64-bit:

+- (250.00) Depth: 41 00:02:39 3969MN, tb=114776563

on Sun Jun 21, 2015 10:16 am by · on Sun Jun 21, 2015 10:16 am by

[fen]8/8/7p/3KNN1k/2p4p/8/3P2p1/8 w - - 0 1[/fen]

Analysis by Komodo 9.1 64-bit:

1.Kc6 g1Q 2.Nxh4 Qa7 3.Nhf3 Qa5 4.Kd6 Qa8 5.Kc5 Qc8+ 6.Kd4 Qa6 7.Kc3 Qa2 8.Kd4 Qb3 9.Kc5 Qa4 10.Kd6 Qb5 11.Ke6 Qc5 12.Kf5 Qd5 13.Kf6 Qd8+ 14.Kf5 Qa8 15.Ke6 Qa3 16.Kd5 Qa6 17.Ke4 Qd6 18.Kf5 Qb4 19.Ke6 Qb3 20.Kf5 Qc2+ 21.Ke6 Qd1 22.Kf5 Qb1+ 23.Ke6 Qb6+ 24.Kf5 Qa7 25.Ke6 Qa8 26.Kd6 Qb7 27.Kc5 Qe4 28.Kd6

-+ (-2.95) Depth: 45 00:00:50 1179MN, tb=37615978

on Sun Jun 21, 2015 10:24 am by · on Sun Jun 21, 2015 10:24 am by

[fen]2k5/2p5/1q1p4/pPpPp1pp/N1P1Pp2/P4PbP/KQ4P1/8 w - - 0 46[/fen]

Analysis by Komodo 9.1 64-bit:

46.Nxb6+ cxb6 47.h4 gxh4 48.Qa1 h3 49.gxh3 h4 50.Qh1 Kd7 51.Kb3 Ke7 52.Qa1 Bf2 53.Qc3 Bg3 54.Qc2 Kf6 55.Qe2 Ke7 56.Qg2 Kf6 57.a4 Kf7 58.Kc3 Ke7 59.Kd3 Kf6 60.Qd2 Ke7 61.Qc3 Bf2 62.Qb2 Bg3 63.Qc2 Kd7 64.Qc3 Bf2 65.Qd2 Bg3 66.Qd1 Bf2 67.Qc1 Ke7 68.Qh1 Bg3 69.Qf1 Kf6 70.Qg2 Ke7 71.Qh1 Kf6

+- (8.39) Depth: 48 00:00:28 770MN, tb=260302

on Sun Jun 21, 2015 10:34 am by · on Sun Jun 21, 2015 10:34 am by

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "3B4/5k2/1n1p4/p1pP4/PbP5/1K6/4B3/8 w - - 0 0"]
[PlyCount "2"]

1. Bxb6 Ke7 *
[/pgn]
The white bishop is locked in forever; it can only be given away for a pawn. Without its support, White's king and light-squared bishop are unable to do anything.

Analysis by Komodo 9.1 64-bit:

2.Bg4 Be1 3.Bc7 Bb4 4.Bf5 Kf6 5.Bd3 Ke7 6.Be2 Kd7 7.Bb8 Bd2 8.Bg4+ Ke7 9.Kc2 Bb4 10.Bc7 Be1 11.Kd3 Bb4 12.Bf3 Be1 13.Kc2 Bb4 14.Bb6 Ke8 15.Kd3 Kd7 16.Bg4+ Ke7 17.Bh3 Be1 18.Bf5 Bb4 19.Be4 Be1 20.Bf3 Ke8 21.Ke2 Bb4 22.Bg4 Ke7 23.Kd3 Be1 24.Bh5 Bb4 25.Bd1 Be1 26.Be2 Bb4 27.Bh5 Be1 28.Kc2 Bb4 29.Be2 Be1 30.Bd1 Kd7 31.Bg4+ Ke7 32.Bc7 Bb4 33.Bf3

+- (4.03) Depth: 59 00:00:07 268MN, tb=774734

Analysis by Stockfish 170615 64 BMI2:

2.Bc7 Kd7 3.Bb8 Be1 4.Bg4+ Ke7 5.Bc7 Bd2 6.Bh3 Be1 7.Kc2 Bb4 8.Be6 Be1 9.Bg4 Bb4 10.Bh3 Be1 11.Be6 Bb4 12.Bb8 Be1 13.Kb3 Bb4 14.Bc8 Be1 15.Bg4 Bd2 16.Bh3 Be1 17.Kc2 Bb4 18.Bc8 Be1 19.Bg4 Bb4 20.Kd3 Be1 21.Bc7 Bb4 22.Be6 Be1 23.Ke4 Bb4 24.Ke3 Be1 25.Kd3 Bb4 26.Bg4 Be1 27.Bb6 Bb4 28.Ke4 Be1 29.Bc7 Bd2 30.Be2 Kd7 31.Bb6 Be1 32.Kd3 Ke7 33.Kc2 Kd7 34.Kb3 Ke7 35.Bg4 Bd2 36.Bc7 Bb4 37.Kc2 Be1 38.Be2 Bb4 39.Bb8 Be1 40.Kd3 Bb4 41.Bh5 Be1 42.Bg4 Bb4 43.Bf5 Be1 44.Kc2 Bb4 45.Ba7 Kf6 46.Bg4 Be1 47.Kb2 Kg5 48.Bh3 Kf4 49.Kc2 Kg3 50.Bb8 Bf2 51.Bxd6+ Kxh3 52.Be7 Bd4
+- (4.49) Depth: 89/104 00:00:09 171MN, tb=48316

on Sun Jun 21, 2015 10:44 am by · on Sun Jun 21, 2015 10:44 am by

[pgn][Event "Wijk aan Zee"]
[Site "Wijk aan Zee"]
[Date "1986.01.31"]
[Round "12"]
[White "Hans Ree"]
[Black "Vlastimil Hort"]
[Result "1/2-1/2"]
[ECO "A41"]
[SetUp "1"]
[FEN "4kn1Q/7r/3p2p1/2bP1pP1/5P1N/6K1/8/8 w - - 0 59"]
[PlyCount "8"]
[EventDate "1986.??.??"]

59. Qg8 Rxh4 60. Kxh4 Bd4 61. Kg3 Ke7 62. Kf3 Ba1 1/2-1/2
[/pgn]

Draw. The queen has no square to go to.

Analysis by Stockfish 170615 64 BMI2:

60.Kxh4 Bd4 61.Kg3 Bb2 62.Kf3 Bc3 63.Ke2 Bb2 64.Kd1 Bd4 65.Kd2 Ke7 66.Kc1 Be3+ 67.Kc2 Bxf4 68.Qg7+ Ke8 69.Qc7 Nd7 70.Kc3 Be5+ 71.Kc4 Bf4 72.Kb5 Be5 73.Kc6 Nf8 74.Qb7 Bf4 75.Qa8+ Kf7 76.Qa7+ Ke8 77.Kc7 Be5 78.Qa8+ Ke7 79.Qd8+ Kf7 80.Kc6 Bg3 81.Kb5 Bf4 82.Kb6 Bh2 83.Ka5 Be5 84.Kb4 Bf4 85.Kb3 Bh2 86.Kc3 Be5+ 87.Kd3 Bf4 88.Ke2 Be5 89.Kf3 Bh2 90.Kg2 Be5 91.Kf1 Bf4 92.Kf2 Be5 93.Ke3 Bg3 94.Kd2 Be5 95.Ke2 Bf4 96.Kd3 Bg3 97.Ke3 Be5 98.Kf2 Bd4+ 99.Kf1 Be5 100.Ke1 Bf4 101.Kd1 Be5 102.Qc7+ Ke8 103.Kc2

+- (2.78) Depth: 71/96 00:00:20 412MN, tb=1256265

on Sun Jun 21, 2015 11:14 am by · on Sun Jun 21, 2015 11:14 am by

[pgn][Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "8/p7/k1N1p3/p1P1p3/1P2P3/3p4/P5PK/8 w - - 0 0"]
[PlyCount "9"]

1. b5+ Kxb5 2. Nxe5 d2 3. a4+ Ka6 4. c6 d1=Q 5. Nd7 *[/pgn]
Black is unable to release his king & and white pawns appears to be protected Indirectly due to forks.

Analysis by Komodo 9.1 64-bit:

5...Qd6+

-+ (-5.42 ++) Depth: 51 00:01:31 1942MN, tb=26214757

New game
8/p2N4/k1P1p3/p7/P3P3/8/6PK/3q4 b - - 0 1

Analysis by Stockfish 170615 64 BMI2:

5...Qd6+ 6.Kg1 Qd4+ 7.Kh2 e5 8.Kg3 Qe3+ 9.Kh2 Qc1 10.Kg3 Qg5+ 11.Kh2 Qe3 12.Kh1 Qc1+ 13.Kh2 Qd1 14.Kg3 Qd3+ 15.Kh2 Qd2 16.Kg1 Qc2 17.Kh2 Qc3 18.Kg1 Qb2 19.Kh2 Qf2 20.Kh1 Qh4+ 21.Kg1 Qe7 22.Kh2 Qg5 23.Kg1 Qh6 24.Kf2 Qh2 25.Kf1 Qf4+ 26.Kg1 Qd2 27.Kh2 Qc2 28.Kg1 Qe2 29.Kh2 Qh5+ 30.Kg1 Qd1+ 31.Kh2 Qg4 32.Kg1 Qg3 33.Kh1 Qg8 34.Kh2 Qa2 35.Kg3 Qf7 36.Kh2 Qg8 37.Kg1 Qc4 38.Kh2 Qf7 39.Kg3 Qg7+ 40.Kh2 Qh6+ 41.Kg3 Qd6 42.Kh2 Qa3 43.Kg1 Qc3 44.Kh2 Qb2 45.Kg3 Qd4 46.Kh2 Qc4

-+ (-5.70) Depth: 63/87 00:00:25 676MN, tb=532176

on Fri Jul 03, 2015 1:49 am by · on Fri Jul 03, 2015 1:49 am by

[fen]8/1k6/p2q4/2p1ppB1/P1B1b1p1/1P4P1/5P2/4R1K1 w - - 0 1[/fen]

Analysis by Komodo 9.1 64-bit:

2.Rxe4 Qd1+ 3.Kh2 fxe4 4.Bh6 Kc6 5.Bg5 Qf3 6.Be3 a5 7.Kg1 Qd1+ 8.Kg2 Kd6 9.Kh2 Qa1 10.Bd2 Qb1 11.Be3 Qd1 12.Kg2 Qf3+ 13.Kh2 Qf8 14.Kg1 Qf6 15.Kg2 Qf5 16.Kg1 Qd7 17.Bg5 Qc7 18.Kg2 Qh7 19.Kg1 Kc6 20.Be3 Qh5 21.Kg2 Qh3+ 22.Kg1 Qh7 23.Be6 Qg6 24.Bc4 Qg7 25.Kh2 Kd6 26.Kg2 Qh8 27.Kg1
-+ (-3.77) Depth: 44 00:00:13 355MN, tb=962751

on Tue Dec 01, 2015 1:21 am by · on Tue Dec 01, 2015 1:21 am by

[fen]nbN5/1Pp5/qpK5/1pp5/kP6/PpP5/1B6/8 w - - 0 0[/fen]

[pgn]

[Event "Blathy O, 1913, White wins"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "New game"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "nbN5/1Pp5/qpK5/1pp5/kP6/PpP5/1B6/8 w - - 0 0"]
[PlyCount "25"]

1. Ne7 Qa7 2. Ng6 Qa6 3. Ne5 Qa7 4. Nd7 c4 5. Ne5 Qa6 6. Ng6 Qa7 7. Ne7 Qa6 8.
Nc8 Qxb7+ 9. Kxb7 c6 10. Kxb8 c5 11. Kxa8 cxb4 12. cxb4 c3 13. Nxb6# *[/pgn]

Analysis by SugaR PrO v1.2b 64 BMI2:

1.Ne7 Qa7 2.Nc8 Qa6
= (-0.07) Depth: 69/16 00:00:34 540MN, tb=8446837
(01.12.2015 02:20:53)

4... c4 is severe mistake right, - Qa6 may hold?

by