Study (in)validation : Paunovic vs. Skembris, 1983 1...Kf8

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Vinvin
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Study (in)validation : Paunovic vs. Skembris, 1983 1...Kf8

Post by Vinvin »

[d]8/5k2/p7/2pP1Pp1/2P3P1/2N3K1/P4N2/5q2 b
Please, I need your help !

1) Is 1...Kf8 winning ?

2) Is 1.. Qxc4 drawish ?

Reference : http://membres.multimania.fr/albillo/book0402.htm

"This outstanding book is part of the essential Encyclopaedia of Chess Endings"..."The analysis includes also six main variations, fully commented using the proprietary code system."
But I don't have access to this variations (and engines may be refute them now !).
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Re: Study (in)validation : Paunovic vs. Skembris, 1983 1...K

Post by AdminX »

Vinvin wrote:[d]8/5k2/p7/2pP1Pp1/2P3P1/2N3K1/P4N2/5q2 b
Please, I need your help !

1) Is 1...Kf8 winning ?

2) Is 1.. Qxc4 drawish ?

Reference : http://membres.multimania.fr/albillo/book0402.htm

"This outstanding book is part of the essential Encyclopaedia of Chess Endings"..."The analysis includes also six main variations, fully commented using the proprietary code system."
But I don't have access to this variations (and engines may be refute them now !).
Here is Critter 1.6a's thoughts on it.

Code: Select all


1 [-2.22]  1.... Qxc4  (0.05)
 2 [-2.30]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2  (0.05)
 4 [-2.18]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qd4+ 4.Ke2  (0.05)
 5 [-2.30]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qd3+ 5.Kf2  (0.05)
 6 [-2.38]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qd4+ 4.Kf3 Ke7 5.d6+ Kd7  (0.05)
 7 [-2.46]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qd4+ 4.Kf3 Ke7 5.Ke2 Qc4+ 6.Kd2 Qd4+ 7.Ke2  (0.08)
 8 [-2.70]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qd4+ 4.Kf3 Ke7 5.d6+ Kd7 6.f6 Qd3+ 7.Kf2 Qc4  (0.09)
 9 [-3.35]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4  (0.10)
10 [-3.07]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.d6 Qf4+ 9.Kd3  (0.10)
11 [-3.43]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.d6 Qf4+ 9.Kd3 Ke8 10.a4  (0.11)
12 [-3.39]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.d6 Qf4+ 9.Kd3 Ke8 10.a4 Qe5  (0.12)
13 [-3.47]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.d6 Qf4+ 9.Kd3 Ke8 10.Nf6+ Kd8 11.Nfe4 Qe5 12.Ke3 Qd4+ 13.Kf3  (0.13)
14 [-3.75]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ke2 Qf4 6.Kd3 Qf1+ 7.Kc2 Qg2+ 8.Kd3 Qxg4 9.Kc4 Qg1 10.Nxc5 Qf1+ 11.Kb4 Qf4+ 12.N3e4 Qxf5 13.Nd6+  (0.17)
15 [-4.04]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Kg2 Qf4 6.Nf2 Qd2 7.Ne4 Qxd5 8.Kf3 c4 9.Ke2 Ke7 10.Nxg5 c3 11.Nge4 Qxa2+ 12.Kd3 c2  (0.37)
16 [-3.95]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke7 4.Nfe4 c4 5.f6+ Ke8 6.f7+ Ke7 7.Nc5 Qe5+ 8.Kf3 Qc3+ 9.Ke2 Qc2+ 10.Ke3 Qc1+ 11.Kd4 Qd2+ 12.Kxc4 Qc2+ 13.Kd4 Qd1+ 14.Kc4 Qc1+ 15.Kd4 Qxg5 16.f8=B+ Ke8  (0.55)
17 [-3.95]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke7 4.Nfe4 c4 5.f6+ Ke8 6.f7+ Ke7 7.Nc5 Qd6+ 8.Kf3 Qd1+ 9.Kf2 Qd2+ 10.Kg3 Qc3+ 11.Kg2 Qb2+ 12.Kf3 Qxa2 13.Nce6 Qa3+ 14.Kf2 Qb2+ 15.Kf1 Qc1+ 16.Ke2 Qc2+ 17.Ke1 Qc3+ 18.Kd1 Qb3+ 19.Ke2 Qc2+  (0.86)
18 [-3.95]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke7 4.Nfe4 c4 5.f6+ Ke8 6.f7+ Ke7 7.Nc5 Qd6+ 8.Kf3 Qd1+ 9.Kf2 Qd2+ 10.Kg3 Qc3+ 11.Kg2 Qb2+ 12.Kf3 Qxa2 13.Nce6 Qa3+ 14.Ke2 Qd3+ 15.Ke1 Qe3+ 16.Kd1 Qb3+ 17.Ke2 Qc2+ 18.Ke1 Qc3+ 19.Kd1 Qb3+  (1.17)
20 [-3.95]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke7 4.Nfe4 c4 5.f6+ Ke8 6.f7+ Ke7 7.Nc5 Qd6+ 8.Kf3 Qd1+ 9.Kf2 Qd2+ 10.Kg3 c3 11.Nce6 Qe1+ 12.Kg2 Qe2+ 13.Kg3 Qe1+  (1.55)
21 [-4.04]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Kf8 4.Ne6+ Ke7 5.Nf4 Qxa2 6.Ng6+  (5.47)
21 [-4.12]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ke2 Qf4 6.Kd3 Qxg4 7.Kc4 Qg1 8.Nxc5 Qf1+ 9.Kd4 Qf2+ 10.Kc4 Qxf5 11.d6 Qe5 12.N3e4 Ke8  (7.32)
21 [-4.24]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Kf8 4.Ne6+ Ke7 5.Nf4 Qxa2 6.Ng6+ Ke8 7.Ne4 c4 8.g5 Qa3+ 9.Kg4 c3 10.Nf6+ Kd8  (8.41)
21 [-4.42]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ke2 Qf4 6.Kd3 Qxg4 7.Kc4 Qg1 8.Nxc5 g4 9.N5e4 Qf1+ 10.Kb4 Qd3  (10.54)
21 [-4.68]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Kf8 4.Ne6+ Ke7 5.Nf4 Qxa2 6.g5 c4 7.Nd5+ Kd6 8.Ne3 Qe2 9.Nfg4 c3 10.g6 c2 11.g7 Qe1+ 12.Kf3 Qh1+ 13.Kf4 Qh7 14.Nxc2 Qxg7 15.f6 Qd7 16.Nce3 Ke6  (12.29)
22 [-4.60]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Kf8 4.Ne6+ Ke7 5.Nf4 Qxa2 6.g5 c4 7.Nd5+ Kd6 8.Ne3 Qe2 9.Nfg4 c3 10.g6 c2 11.g7 Qe1+ 12.Kf3 Qh1+ 13.Kf4 Qh7 14.Nxc2 Qxg7 15.Nce3 Qd4+ 16.Kg5 Qd3 17.f6  (12.70)
22 [-4.52]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Kf8 4.Ne6+ Ke7 5.Nf4 Qxa2 6.g5 c4 7.Nd5+ Kd6 8.Ne3 Qe2 9.Nfg4 c3 10.g6 c2 11.g7 c1=R 12.g8=Q  (12.88)
22 [-4.40]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke3 Qc1+ 5.Kd3 Qf1+ 6.Kc2 Qg2+ 7.Kb3  (14.63)
22 [-4.76]  1.... Qxc4  (15.31)
22 [-5.04]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Kf8 4.Ne6+ Ke7 5.Nf4 Qxa2 6.g5 c4 7.Nd5+ Kd6 8.Ne3 Qe2 9.Nfg4 c3 10.g6 c2 11.g7 Qe1+ 12.Kf3 Qd1+ 13.Kg2 c1=Q 14.Nxd1 Qg5 15.Nf2 Qxg7 16.Ne4+ Kd5 17.Kf3 a5 18.Ne3+ Ke5 19.f6 Qc7  (19.29)
22 [-5.13]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ke2 Qf4 6.Nxg5+ Qxg5  (27.93)
23 [-5.21]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Kf8 4.Nfh3 Qd6+ 5.Nf4 c4 6.f6 c3 7.Kg2 c2 8.Ng6+ Ke8 9.f7+ Kd7 10.f8=Q Qxf8 11.Nxf8+ Ke8 12.Nfh7 c1=Q 13.Nf6+ Ke7 14.Nge4 Qb2+ 15.Kf3 Ke6 16.a4 Qa1 17.Kf2 Qa2+ 18.Kf3  (32.31)
24 [-5.29]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Kf8 4.Nfh3 Qd6+ 5.Nf4 c4 6.f6 c3 7.Ne6+  (37.81)
24 [-5.13]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Kf8 4.Nfh3 Qd6+ 5.Nf4 c4 6.f6 c3 7.Kh3 c2 8.Ng6+  (39.66)
24 [-5.01]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Kf8 4.Nfh3 Qd6+ 5.Nf4 c4 6.f6 c3 7.Kg2 Qd2+ 8.Kh3 c2 9.Ng6+ Ke8 10.f7+  (40.54)
24 [-5.37]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Kf8 4.Nfh3 Qd6+ 5.Nf4 c4 6.f6 c3 7.Kg2 c2 8.Ng6+ Ke8 9.f7+ Kd7 10.f8=Q Qxf8  (46.01)
24 [-4.82]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3  (62.44)
24 [-5.61]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.Kd2 Qxg4 8.Ke3 Kf8 9.f6 Qf5 10.Nxc5 Qxd5 11.Ne4 Kf7 12.N2c3 Qe5 13.Ne2 Qa5 14.N2c3 g4 15.Kd4  (65.94)
25 [-5.53]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2  (67.08)
25 [-5.61]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3  (70.11)
26 [-5.53]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+  (75.34)
26 [-5.45]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke7 4.Nfe4  (76.18)
26 [-5.15]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke7 4.Nfe4 c4 5.f6+ Kd8 6.f7 Ke7 7.Nc5 Qe5+ 8.Kf3 Qf6+ 9.Ke2 Qb2+ 10.Kf3 Qa3+ 11.Ke2 Qxa2+ 12.Ke3 Qg2 13.Nce6 Qg1+ 14.Kd2 c3+ 15.Kxc3  (77.93)
26 [-4.87]  1.... Qxc4 2.Nce4  (80.16)
26 [-5.69]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke7 4.Nfh3 c4 5.Nf4 Qd4 6.Nf3 Qd6 7.Ne1 Qd1 8.Neg2 c3 9.Ne3 c2 10.Nxd1 cxd1=Q  (88.56)
26 [-6.30]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke7 4.Nfh3 c4 5.a3 c3 6.Nf4 Qh1 7.Nf3 c2  (119.52)
26 [-6.42]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N4g3 Qxg4 8.d6 c4  (224.01)
27 [-6.34]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N4g3 Qxg4 8.Ne4 Kf8 9.f6 Qf5 10.Nxc5 Qxd5  (225.74)
27 [-6.26]  1.... Qxc4 2.Nfe4  (229.58)
27 [-6.50]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+  (257.50)
27 [-6.98]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.Ne2 Kf8 9.f6 Qf5 10.Nxc5 Qxd5 11.Ne4 Qxa2 12.Nxg5 Qb3+ 13.Kf2 Qb6+ 14.Kg2 Qb2 15.Kf3 Qxf6+ 16.Kg4  (342.33)
28 [-6.90]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.d6 Qf4+ 9.Kd3  (349.61)
28 [-6.52]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2  (364.64)
28 [-7.07]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.d6 Qf4+ 9.Kd3 Qc1 10.Nc3 Qg1 11.Nce4 Qd1+  (371.25)
28 [-6.90]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.Ne2 Kf8 9.f6 Qf5 10.Nxc5 Qxd5 11.Ne4 Qxa2 12.Nxg5 Qb3+ 13.Kf2 Qb6+ 14.Kg2 Qb2 15.Kf3 Qxf6+ 16.Kg4  (388.19)
29 [-6.98]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.Ne2 Kf8 9.f6 Qf5 10.Nxc5 Qxd5 11.Ne4 Qxa2 12.Nxg5 Qb3+  (404.37)
29 [-6.82]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.Ne2 Kf8 9.Nxc5 Qxf5 10.Ne4 Qxd5 11.N2c3  (406.79)
29 [-6.52]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+ 4.Kf3 Qc1 5.Kg2 Qf4 6.Ng3 Qxg4 7.Ne4  (410.13)
29 [-7.07]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+ 4.Kf3 Qc1 5.Kg2 Qf4 6.Kh3 Qf3+ 7.Kh2 Qxg4 8.f6 c4 9.a4 Qf4+ 10.Kg2 g4  (424.82)
29 [-5.84]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ke2 Qf4 6.Kd3 Qxg4 7.Kc4  (460.38)
29 [-7.51]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Kg2 Qf4 6.f6  (957.41)
31 [-7.51]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Kg2 Qf4  (991.96)
32 [-7.43]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Kg2 Qc2+ 6.Kh3 Qc1 7.d6 Qh1+ 8.Kg3 Qg1+ 9.Kf3  (1001.55)
32 [-7.35]  1.... Qxc4 2.Nfe4  (1002.85)
32 [-7.59]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke1 Qc1+ 5.Nd1 Qb1 6.Nxg5+ Ke7 7.Ke2 Qxa2+ 8.Ke1  (1707.29)
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Re: Study (in)validation : Paunovic vs. Skembris, 1983 1...K

Post by AdminX »

Vinvin wrote:[d]8/5k2/p7/2pP1Pp1/2P3P1/2N3K1/P4N2/5q2 b
Please, I need your help !

1) Is 1...Kf8 winning ?

2) Is 1.. Qxc4 drawish ?

Reference : http://membres.multimania.fr/albillo/book0402.htm

"This outstanding book is part of the essential Encyclopaedia of Chess Endings"..."The analysis includes also six main variations, fully commented using the proprietary code system."
But I don't have access to this variations (and engines may be refute them now !).
And here is Stockfish, to me it looks like a draw.

Code: Select all


1 [-2.22]  1.... Qxc4  (0.05)
 2 [-2.30]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2  (0.05)
 4 [-2.18]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qd4+ 4.Ke2  (0.05)
 5 [-2.30]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qd3+ 5.Kf2  (0.07)
 6 [-2.38]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qd4+ 4.Kf3 Ke7 5.d6+ Kd7  (0.07)
 7 [-2.46]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qd4+ 4.Kf3 Ke7 5.Ke2 Qc4+ 6.Kd2 Qd4+ 7.Ke2  (0.07)
 8 [-2.34]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qd4+ 4.Kf3 Ke7 5.d6+ Kd7 6.f6 Qe5 7.Ke2 Ke6 8.a3  (0.08)
 9 [-2.30]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qd4+ 4.Kf3 Ke7 5.d6+ Kd7 6.f6 Qe5 7.Ke2 Ke6 8.a3 Qh2+ 9.Ke3 Qf4+  (0.09)
10 [-3.31]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.d6 Qf4+ 9.Kd3 Ke8  (0.11)
11 [-3.15]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke1 Qc1+ 5.Ke2 Qf4 6.Kd3 Qf1+ 7.Kc2 Qg2+ 8.Kb3 Qxg4 9.Kc4 Qg1 10.Ne2  (0.13)
12 [-3.31]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.d6 Qf4+ 9.Kd3 Ke8 10.Nf6+ Kd8 11.Nfe4 a5  (0.15)
13 [-3.47]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.d6 Qf4+ 9.Kd3 Ke8 10.Nf6+ Kd8 11.Nfe4 Qe5 12.Ke3 Qd4+ 13.Kf3  (0.16)
14 [-3.79]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke3 Qc1+ 5.Kd3 Qf1+ 6.Kc2 Qg2+ 7.Kb3 Qxg4 8.a4 Ke7 9.d6+ Kd8 10.Nxc5 Qxf5 11.Kb4  (0.29)
15 [-3.91]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke3 Qc1+ 5.Kd3 Qf1+ 6.Kc2 Qg2+ 7.Kb3 Qxg4 8.a4 Ke7 9.d6+ Kd8 10.Nxc5 Qxf5 11.Kb4 Qe5  (0.60)
16 [-4.08]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke3 Qc1+ 5.Kd3 Qf1+ 6.Kc2 Qg2+ 7.Kb3 Qxg4 8.Kc4 Qg1 9.Nxc5 Qf1+ 10.Nd3 Qxf5 11.Kd4 g4 12.Ne5+ Ke7 13.Ne4  (0.94)
17 [-4.00]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke3 Qc1+ 5.Kd3 Qf1+ 6.Kc2 Qg2+ 7.Kb3 Qxg4 8.Kc4 Qg1 9.Nxc5 Qf1+ 10.Nd3 Qxf5 11.Kd4 g4 12.Ne4 Ke7 13.d6+ Ke8 14.Ne5 g3 15.Kd5  (1.05)
18 [-3.83]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke3 Qc1+ 5.Kd3 Qf1+ 6.Kc2 Qg2+ 7.Kb3 Qxg4 8.Kc4 Qg1 9.Nxc5 Qf1+ 10.Nd3 Qxf5 11.Kd4 Qg4+ 12.Ne4 Qg1+ 13.Ke5 Qh2+ 14.Kd4 Qxa2 15.Nxg5+ Ke7  (1.51)
19 [-3.95]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke3 Qc1+ 5.Kd3 Qf1+ 6.Kc2 Qg2+ 7.Kb3 Qxg4 8.Kc4 Qg1 9.Nxc5 Qf1+ 10.Nd3 Qxf5 11.Kd4 Qg4+ 12.Ne4 Qg1+ 13.Ke5 Qh2+ 14.Kd4 Qxa2 15.d6 Qa4+ 16.Kd5 Qb3+ 17.Kd4 Qb6+  (1.64)
20 [-4.24]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke3 Qc1+ 5.Kd3 Qf1+ 6.Kc2 Qg2+ 7.Kd3 Qxg4 8.Kc4 Qg1 9.Nxc5 Qf1+ 10.Kd4 g4 11.N5e4 g3 12.Nd6+ Ke7 13.Nc8+ Kd7  (2.00)
20 [-4.42]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke7 4.f6+ Kxf6 5.Nge4+ Ke7  (2.19)
20 [-4.64]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke3 Qc1+ 5.Kd3 Qf1+ 6.Kc2 Qg2+ 7.Kd3 Qxg4 8.Kc4 Qg1 9.Nxc5 Qf1+ 10.Nd3 Qxf5 11.Kd4 Qf6+ 12.Kc4 g4 13.Ne4 Qa1 14.d6 Qxa2+ 15.Kd4 Qc2 16.Nb4 Qa4  (2.77)
21 [-4.56]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke1 Qc1+ 5.Nd1 Qb1 6.Nxg5+ Kf6 7.Nf3 Qd3 8.Nd2 Qg3+ 9.Kf1 Qh3+ 10.Ke1  (3.39)
21 [-4.72]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke1 Qc1+ 5.Nd1 Qb1 6.Nxg5+ Kf6 7.Nf3 Qe4+ 8.Kf2 Qxg4 9.Ne3 Qa4 10.d6 Qxa2+ 11.Ke1 Qb1+ 12.Ke2 Qb2+ 13.Ke1  (3.65)
21 [-4.64]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke1 Qc1+ 5.Ke2 Qf4 6.Kd3 Qxg4 7.Kc4 Qg1 8.Nxc5 Qf1+ 9.Nd3 Qxf5 10.Kd4 Qf6+ 11.Kc4 g4 12.Ne4 Qa1 13.d6 Qxa2+ 14.Kd4 Qc2 15.Nb4 Qa4  (3.91)
22 [-4.80]  1.... Qxc4 2.Nce4 Qxd5 3.Nh3 c4 4.Nexg5+ Kf6 5.Nh7+ Ke5 6.N3g5 c3 7.Nf3+ Kd6 8.Nf6 Qd3 9.Ne8+ Ke7  (5.15)
22 [-4.56]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke7 4.Nfe4 c4 5.f6+ Ke8 6.f7+ Ke7 7.Nc5 Qd1 8.Nce6 Qg1+ 9.Kf3 Qf1+ 10.Kg3 Qg1+  (7.24)
22 [-4.38]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke7 4.Nfe4 c4 5.f6+ Ke8 6.f7+ Ke7 7.Nc5 Qe5+ 8.Kf3 Qc3+ 9.Ke2 Qa3 10.Nce6 Qb2+ 11.Kf3 Qa3+ 12.Kg2 Qb2+ 13.Kf3  (8.01)
22 [-4.92]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke8 4.Nge4 Ke7 5.Kf3 c4 6.Ke2 Qa5 7.f6+ Kf7 8.Nd6+ Kxf6 9.Nfe4+ Ke6 10.Nxc4 Qxa2+ 11.Kd3 Qb1+ 12.Kd4 Qd1+  (15.15)
22 [-4.96]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+ 4.Kf3 Qc1 5.Ke2 Qf4 6.Kd3 Qxg4 7.Kc4 Qg1 8.Nxc5 Qf1+ 9.Nd3 Qxf5 10.Kd4 Qf6+ 11.Kc4 g4 12.Ne4 Qa1 13.d6 Ke6 14.a3 Qxa3  (20.38)
23 [-5.05]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+  (22.52)
23 [-4.88]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke1 Qc1+ 5.Nd1 Qb1 6.Nxg5+ Kf6 7.Nf3 Qe4+ 8.Kf2 Qxg4 9.Ne3 Qa4 10.Nh2 Qxa2+ 11.Kf3 Ke7 12.Nhg4  (23.65)
23 [-5.13]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke1 Qc1+ 5.Nd1 Qb1 6.Nxg5+ Ke7 7.Nf3 Qd3 8.Ng1 Qg3+ 9.Kf1 Qxg4 10.Ne3 Qg3 11.d6+ Kxd6  (24.15)
23 [-4.76]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke8 4.Nge4 Ke7 5.f6+ Ke8 6.Kh4 c4 7.Nc3 Qe5 8.Nfe4 Kf7 9.g5 Qf4+ 10.Kh3 Qf3+ 11.Kh2 Kg6 12.Kg1 a5 13.Kh2 Qf1 14.Kg3 Qg1+  (26.69)
23 [-5.31]  1.... Qxc4 2.Nce4 Qxd5  (28.26)
23 [-5.41]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke1 Qc1+ 5.Ke2 Qf4 6.Kd3 Qxg4 7.Kc4 Qg1 8.Nxc5 Qf1+ 9.Kb3 Qxf5 10.Kc4 g4 11.N3e4 Qf1+ 12.Nd3 Qa1 13.d6 Qxa2+ 14.Kd4 Qa1+ 15.Ke3 Ke6  (35.11)
24 [-5.33]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.Kd2 Qxg4 8.Ke3 c4 9.f6 Qh3+ 10.N2g3 Qg2 11.Kd4 Qb2+ 12.Kxc4 Qb5+ 13.Kd4  (37.63)
24 [-5.25]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.Kd2 Qxg4 8.Ke3 c4 9.f6 Qh3+ 10.N2g3  (38.09)
24 [-5.49]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+  (41.04)
24 [-5.13]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N2g3 Qxg4 8.d6  (41.71)
24 [-5.67]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Kg2 Qf4 6.Ng3 Qxg4 7.Ne4 c4 8.d6  (47.39)
24 [-5.77]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Kg2 Qf4 6.Nf2 Qd2 7.Ne4 Qxd5 8.Kf1 c4 9.Ke2 c3 10.Nxc3 Qc4+ 11.Kd2 Qd4+ 12.Nd3 Kg7 13.Nd1 Qxg4 14.Ne3 Qf3 15.Nc5 g4 16.Ne6+ Kf6  (55.02)
25 [-5.69]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Kg2 Qf4 6.Nf2 Qd2 7.Ne4 Qxd5 8.Kf3 c4 9.Ke2 c3 10.Nxc3 Qc4+ 11.Kd2 Qd4+ 12.Nd3 Kg7 13.Nd1 Qxg4 14.Ne3 Qf3 15.a3 g4 16.Ne5  (55.61)
25 [-5.77]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Kg2 Qf4 6.Nf2 Qd2 7.Ne4 Qxd5 8.Kf3 c4 9.Ke2 c3 10.Nxc3 Qc4+ 11.Kd2 Qd4+ 12.Nd3 Kg7 13.Nd1 Qxg4 14.Ne3 Qf3 15.a3 g4 16.Ne5 Qf2+ 17.Kd3 g3  (56.58)
26 [-5.69]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.Kd2 Qxg4 8.Ke3  (58.52)
26 [-5.04]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke7 4.Nfe4 Qxa2 5.Nf3  (67.41)
26 [-5.85]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke8 4.Nge4 Ke7 5.Kf4 c4 6.Nh1 c3 7.Nxc3 Qd2+ 8.Ke4 Qxc3  (77.52)
26 [-6.10]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N4g3 Qxg4 8.d6 Qc4 9.Ne4 Qxa2 10.Nxg5+ Kf6 11.Ne4+ Kxf5 12.d7 Qd5 13.Nxc5 Ke5 14.Nxa6 Qxd7 15.Nb4 Qa7+ 16.Kd3 Qc5 17.Nc2 Qb5+ 18.Kd2 Qc4 19.Ne3 Qb4+  (119.03)
29 [-6.18]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+  (162.70)
29 [-6.02]  1.... Qxc4 2.Nfe4  (192.35)
29 [-6.26]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke3 Qc1+ 5.Kf3 Qf4+ 6.Kg2 Qxg4+ 7.Ng3  (212.56)
29 [-6.67]  1.... Qxc4 2.Nce4 Qxd5  (355.49)
29 [-6.74]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N4g3 Qxg4 8.Ne4 Qg2 9.d6 g4 10.N2g3 Qf3+ 11.Kd2 Qa3 12.Nc3 Qb4 13.Ne4 Qd4+ 14.Ke2  (636.75)
30 [-6.66]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+ 4.Kf3 Qc1 5.Ne2 Qh1+ 6.Ke3 Qh3+ 7.N4g3 Qxg4 8.Ne4 Qg2 9.N2g3 Qg1+ 10.Ke2 c4 11.Nxg5+  (648.77)
30 [-6.58]  1.... Qxc4 2.Nfe4  (660.95)
30 [-6.82]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kg2 Qc2+ 4.Kf3 Qc1 5.d6 Qf4+ 6.Ke2 Qxg4+ 7.Ke3 Qxf5 8.Nd1 g4  (860.52)
30 [-5.60]  1.... Qxc4 2.Nfe4  (1083.08)
30 [-6.98]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke8 4.Nfe4 Qd3+ 5.Kh4 c4 6.Nf6+ Kd8 7.Nfh7 Qe2 8.Kh5 c3 9.f6 c2 10.f7 Qh2+ 11.Kg6 Qd6+ 12.Kf5 c1=Q 13.f8=Q+ Qxf8+ 14.Nxf8 Qf1+ 15.Ke5 Qe1+ 16.Kf6 Qf2+  (1701.82)
31 [-6.90]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke8 4.Ne6 Qd2  (1889.75)
31 [-6.82]  1.... Qxc4 2.Nce4  (1917.47)
31 [-7.07]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke8 4.Ne6 Qe5+ 5.Kf3 c4  (2004.32)
31 [-7.34]  1.... Qxc4 2.Nce4 Qxd5 3.Nxg5+ Ke8 4.Ne6 Qe5+  (2248.64)
31 [-6.52]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2  (2794.19)
31 [-7.23]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke1 Qc1+ 5.Nd1 Qb1 6.Nxg5+ Ke7 7.d6+ Kxd6 8.Nf3 Qe4+ 9.Kf2 Qc2+ 10.Ke1 Qd3 11.Nd2 Ke7 12.Nb2 Qg3+ 13.Kd1 Qxg4+ 14.Kc2 Qxf5+ 15.Kd1 Qh5+ 16.Kc2 Qg6+ 17.Kc3 Qg3+ 18.Kc2 Qa3 19.Ne4 Qxa2 20.Nxc5 Qd5 21.Nca4 a5 22.Nc3 Qd4 23.Kb3 Ke6 24.Nc4  (3356.78)
32 [-7.23]  1.... Qxc4 2.Nfe4 Qd3+ 3.Kf2 Qc2+ 4.Ke1 Qc1+ 5.Nd1 Qb1 6.Nxg5+ Ke7 7.d6+ Kxd6 8.Nf3 Qe4+ 9.Kf2 Qc2+ 10.Ke1 Qd3 11.Nd2 Ke7 12.Nb2 Qg3+ 13.Kd1 Qxg4+ 14.Kc2 Qxf5+ 15.Kd1 Qh5+ 16.Kc2 Qg6+ 17.Kc3 Qg3+ 18.Kc2 Qa3 19.Ne4 Qxa2 20.Nxc5 Qd5 21.Nca4 a5 22.Nc3 Qd4 23.Kb3  (3449.32)
"Good decisions come from experience, and experience comes from bad decisions."
__________________________________________________________________
Ted Summers
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User avatar
Ajedrecista
Posts: 2252
Joined: Wed Jul 13, 2011 9:04 pm
Location: Madrid, Spain.

Encyclopedia of Chess Endings, #1104: all the variations.

Post by Ajedrecista »

Hello Vincent:
Vinvin wrote:[d]8/5k2/p7/2pP1Pp1/2P3P1/2N3K1/P4N2/5q2 b
Please, I need your help !

1) Is 1...Kf8 winning ?

2) Is 1.. Qxc4 drawish ?

Reference : http://membres.multimania.fr/albillo/book0402.htm

"This outstanding book is part of the essential Encyclopaedia of Chess Endings"..."The analysis includes also six main variations, fully commented using the proprietary code system."
But I don't have access to this variations (and engines may be refute them now !).
It is indeed the study #1104 of Encyclopedia of Chess Endings of 1989. I have transcribed all the variations, hoping no typos:
1104. 1... Kf8!! [1 ... Qc4 2.
Nfe4=] 2. d6 [2. Nce4 Qc4 3. Ng5 Qd5
4. Ne6 Ke7 with the idea c4-+; 2.Nfe4 Qf4 3.
Kh3 Qf3 4. Kh2 Qg4 5. f6 Qf4 6. Kg1
g4 7. d6 Ke8-+; 2. f6 Qc4 3. Nfe4 Qf1
with the idea Qf4-+] Qc4 3. Nfe4 Qf1 [with the idea Qf4]
4. Nf2 only move [4. d7 Qd3 -+] Qc1 5. Nce4
Qe3 6. Kg2 c4 7.f6 Ke8 8. Ng3 c3 9.
d7 Kd7 10. f7 Qe7 11. Nd3 c2 12. Nf5
Qf7 13. Ne5 Ke6 0 : 1 [Skembris]
I hope that this stuff will be useful for future analysis in this thread. Have fun!

Regards from Spain.

Ajedrecista.
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Vinvin
Posts: 5334
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Encyclopedia of Chess Endings, #1104: all the variations

Post by Vinvin »

Ajedrecista wrote:Hello Vincent:
Vinvin wrote:[d]8/5k2/p7/2pP1Pp1/2P3P1/2N3K1/P4N2/5q2 b
Please, I need your help !

1) Is 1...Kf8 winning ?

2) Is 1.. Qxc4 drawish ?

Reference : http://membres.multimania.fr/albillo/book0402.htm

"This outstanding book is part of the essential Encyclopaedia of Chess Endings"..."The analysis includes also six main variations, fully commented using the proprietary code system."
But I don't have access to this variations (and engines may be refute them now !).
It is indeed the study #1104 of Encyclopedia of Chess Endings of 1989. I have transcribed all the variations, hoping no typos:
1104. 1... Kf8!! [1 ... Qc4 2.
Nfe4=] 2. d6 [2. Nce4 Qc4 3. Ng5 Qd5
4. Ne6 Ke7 with the idea c4-+; 2.Nfe4 Qf4 3.
Kh3 Qf3 4. Kh2 Qg4 5. f6 Qf4 6. Kg1
g4 7. d6 Ke8-+; 2. f6 Qc4 3. Nfe4 Qf1
with the idea Qf4-+] Qc4 3. Nfe4 Qf1 [with the idea Qf4]
4. Nf2 only move [4. d7 Qd3 -+] Qc1 5. Nce4
Qe3 6. Kg2 c4 7.f6 Ke8 8. Ng3 c3 9.
d7 Kd7 10. f7 Qe7 11. Nd3 c2 12. Nf5
Qf7 13. Ne5 Ke6 0 : 1 [Skembris]
I hope that this stuff will be useful for future analysis in this thread. Have fun!

Regards from Spain.

Ajedrecista.
Thanks, Jesús !
The 1st step of the verification is :
After 1 ... Qc4 2. Nfe4
[d]8/5k2/p7/2pP1Pp1/2q1N1P1/2N3K1/P7/8 b - - 1 2
Do engines don't find a way to make progress (= is it a fortress) ?
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kgburcham
Posts: 2016
Joined: Sun Feb 17, 2008 4:19 pm

Re: Study (in)validation : Paunovic vs. Skembris, 1983 1...K

Post by kgburcham »

[d] 8/5k2/p7/2pP1Pp1/2P3P1/2N3K1/P4N2/5q2 b - -

multi pv
28 43:27 -5.07 1...Qxc4 2.Nfe4 Qd3+ 3.Kf2 Kf8 (51.392.423.691) 19710 TB:2.583
28 43:27 -5.00 1...Kf8 2.Nce4 Qxc4 3.Nxg5 Qxd5 (51.392.423.691) 19710 TB:2.583
28 43:27 -4.50 1...Kg7 2.Nfe4 Qxc4 3.Kf2 Qd4+ (51.392.423.691) 19710 TB:2.583
28 43:27 -4.11 1...Kg8 2.d6 Qxc4 3.Nfe4 Qd3+ (51.392.423.691) 19710 TB:2.583
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Vinvin
Posts: 5334
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Study (in)validation : Paunovic vs. Skembris, 1983 1...K

Post by Vinvin »

kgburcham wrote:[d] 8/5k2/p7/2pP1Pp1/2P3P1/2N3K1/P4N2/5q2 b - -

multi pv
28 43:27 -5.07 1...Qxc4 2.Nfe4 Qd3+ 3.Kf2 Kf8 (51.392.423.691) 19710 TB:2.583
28 43:27 -5.00 1...Kf8 2.Nce4 Qxc4 3.Nxg5 Qxd5 (51.392.423.691) 19710 TB:2.583
28 43:27 -4.50 1...Kg7 2.Nfe4 Qxc4 3.Kf2 Qd4+ (51.392.423.691) 19710 TB:2.583
28 43:27 -4.11 1...Kg8 2.d6 Qxc4 3.Nfe4 Qd3+ (51.392.423.691) 19710 TB:2.583
Position is deeper than that ...
Please run an overnight analyze on this to see if progress is possible :
[d]8/5k2/p7/2pP1Pp1/2q1N1P1/2N3K1/P7/8 b - - 1 2 ...
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zullil
Posts: 6442
Joined: Tue Jan 09, 2007 12:31 am
Location: PA USA
Full name: Louis Zulli

Re: Encyclopedia of Chess Endings, #1104: all the variations

Post by zullil »

Vinvin wrote:
Ajedrecista wrote:Hello Vincent:
Vinvin wrote:[d]8/5k2/p7/2pP1Pp1/2P3P1/2N3K1/P4N2/5q2 b
Please, I need your help !

1) Is 1...Kf8 winning ?

2) Is 1.. Qxc4 drawish ?

Reference : http://membres.multimania.fr/albillo/book0402.htm

"This outstanding book is part of the essential Encyclopaedia of Chess Endings"..."The analysis includes also six main variations, fully commented using the proprietary code system."
But I don't have access to this variations (and engines may be refute them now !).
It is indeed the study #1104 of Encyclopedia of Chess Endings of 1989. I have transcribed all the variations, hoping no typos:
1104. 1... Kf8!! [1 ... Qc4 2.
Nfe4=] 2. d6 [2. Nce4 Qc4 3. Ng5 Qd5
4. Ne6 Ke7 with the idea c4-+; 2.Nfe4 Qf4 3.
Kh3 Qf3 4. Kh2 Qg4 5. f6 Qf4 6. Kg1
g4 7. d6 Ke8-+; 2. f6 Qc4 3. Nfe4 Qf1
with the idea Qf4-+] Qc4 3. Nfe4 Qf1 [with the idea Qf4]
4. Nf2 only move [4. d7 Qd3 -+] Qc1 5. Nce4
Qe3 6. Kg2 c4 7.f6 Ke8 8. Ng3 c3 9.
d7 Kd7 10. f7 Qe7 11. Nd3 c2 12. Nf5
Qf7 13. Ne5 Ke6 0 : 1 [Skembris]
I hope that this stuff will be useful for future analysis in this thread. Have fun!

Regards from Spain.

Ajedrecista.
Thanks, Jesús !
The 1st step of the verification is :
After 1 ... Qc4 2. Nfe4
[d]8/5k2/p7/2pP1Pp1/2q1N1P1/2N3K1/P7/8 b - - 1 2
Do engines don't find a way to make progress (= is it a fortress) ?
Here is what Critter-1.6a (8 threads, 4GB hash) yields after a long search. I haven't studied the line yet:

Code: Select all

31/86  752:27  562221M  12452K  +6.17 Qd3+ Kf2 Qc2+ Kg1 Qc1+ Kg2 Qe3 d6 Qf4 Nf2 Qxd6 Nce4 Qe7 Kf3 c4 Ke3 Qd8 Ke2 Ke7 f6+ Kf7 Nxg5+ Kxf6 Nge4+ Ke5 Nc3 Qd4 Nfe4 Qd3+ Ke1 Qe3+ Kd1 Qg1+ Kc2 Qxg4 Nd2 Kd4 Nde4 Qg2+ Nd2 Qg6+ Nde4 Qh7 a3 Qg6 a4 Qh7 a5 Qh5 Nd2 Qg6+ Nde4 Qg2+ Nd2 Qg4 Nde4 Qf3 Kd2 Qh3 Kc2 Qh2+ Nd2 Qh5 Kb2 Qxa5 Nf3+ Kd3 Ne1+ Ke3 Nc2+ Kd2 Ne4+ Kd3

32/86  918:11  688615M  12499K  +6.17 Qd3+ Kf2 Qc2+ Kg1 Qc1+ Kg2 Qe3 d6 Qf4 Nf2 Qxd6 Nce4 Qe7 Kf3 c4 Ke3 Qd8 Ke2 Ke7 f6+ Kf7 Nxg5+ Kxf6 Nge4+ Ke5 Nc3 Qd4 Nfe4 Qd3+ Ke1 Qe3+ Kd1 Qg1+ Kc2 Qxg4 Nd2 Kd4 Nde4 Qg2+ Nd2 Qg6+ Nde4 Qh7 a3 Qg6 a4 Qh7 a5 Qh5 Nd2 Qg6+ Nde4 Qg2+ Nd2 Qg4 Nde4 Qf3 Kd2 Qh3 Kc2 Qh2+ Nd2 Qh5 Kb2 Qxa5 Nf3+ Kd3 Ne1+ Ke3 Nc2+ Kd2 Ne4+ Kd3
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