Clever study

Discussion of anything and everything relating to chess playing software and machines.

Moderator: Ras

Jack Lad
Posts: 8557
Joined: Wed Mar 08, 2006 10:01 pm
Location: UK

Clever study

Post by Jack Lad »

[d] 1QK3kq/6p1/8/6B1/8/8/8/8 w - - 0 1
White to play and win.

Of course this one is instantly solved by a six man EG database but how does your engine do without it? :roll:
Now cracks a noble heart.—Good night, sweet Princess, And flights of angels sing thee to thy rest!
Top
plattyaj

Re: Clever study

Post by plattyaj »

This doesn't look too tricky. Schola doesn't have any specific knowledge but finds Kb7 after 42 seconds or so. It never resolves the fail low (well, I killed it before then) but it would play the winning line if it had enough time.

Code: Select all

15 253 311 3957095 Kd7+ Kh7 Qb1+ Kg8 Qb3+ Kh7 Qd3+ Kg8 Qd5+ Kh7 Qf5+ Kg8 Bf4 Qh4
 Qd5+ Kh7 Qe4+ g6 Ke6 Qh3+ Ke5 Kg7 Be3
15 253 384 5075219 Kd7+ Kh7 Qb1+ Kg8 Qb3+ Kh7 Qd3+ Kg8 Qd5+ Kh7 Qf5+ Kg8 Bf4 Qh4
 Qd5+ Kh7 Qe4+ g6 Ke6 Qh3+ Ke5 Kg7 Be3
16 253 498 6627149 Kd7+ Kh7 Qb1+ Kg8 Qb3+ Kh7 Qd3+ Kg8 Qd5+ Kh7 Qf5+ Kg8 Bf4 Qh4
 Qd5+ Kh7 Qe4+ g6 Ke6 Qh3+ Ke5 Kg7 Qe3 Qxe3+ Bxe3
16 253 673 9164847 Kd7+ Kh7 Qb1+ Kg8 Qb3+ Kh7 Qd3+ Kg8 Qd5+ Kh7 Qf5+ Kg8 Bf4 Qh4
 Qd5+ Kh7 Qe4+ g6 Ke6 Qh3+ Ke5 Kg7 Qe3 Qxe3+ Bxe3
17 253 900 12264734 Kd7+ Kh7 Qb1+ Kg8 Qb3+ Kh7 Qd3+ Kg8 Qd5+ Kh7 Qf5+ Kg8 Be3 Qh
4 Qd5+ Kh7 Qd3+ g6 Ke6 Kg7 Ke5
17 253 1268 17398543 Kd7+ Kh7 Qb1+ Kg8 Qb3+ Kh7 Qd3+ Kg8 Qd5+ Kh7 Qf5+ Kg8 Be3 Q
h4 Qd5+ Kh7 Qd3+ g6 Ke6 Kg7 Ke5
18 252 2364 32534313 Kd7+ Kh7 Qb1+ Kg8 Qb3+ Kh7 Qd3+ Kg8 Qd5+ Kh7 Qf5+ Kg8 Be3 Q
h4 Bf4 Qf6 Qxf6 gxf6 Ke6 Kg7 Kd5
18 353 4286 59197431 Kb7+ ++
18 353 4301 59496047 Kb7+ --
Andy.
Top
User avatar
AdminX
Posts: 6363
Joined: Mon Mar 13, 2006 2:34 pm
Location: Acworth, GA

Re: Clever study

Post by AdminX »

Analysis by Stockfish 1.5 JA 64bit:

1.Kb7+ Kh7 2.Qh2+ Kg6 3.Qxh8 Kxg5 4.Qxg7+ Kf4 5.Qd4+ Kg3 6.Kc6 Kg2 7.Kd5 Kf3 8.Qd2 Kg4 9.Ke4 Kg3 10.Qe1+ Kg2 11.Kf4 Kh2 12.Kf3 Kh3 13.Qh1#
+- (16.40) Depth: 6 00:00:02 5kN
+- (#13) Depth: 21 00:00:24 89912kN
"Good decisions come from experience, and experience comes from bad decisions."
__________________________________________________________________
Ted Summers
Top
bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: Clever study

Post by bob »

Jack Lad wrote:[d] 1QK3kq/6p1/8/6B1/8/8/8/8 w - - 0 1
White to play and win.

Of course this one is instantly solved by a six man EG database but how does your engine do without it? :roll:
Crafty doesn't find the mate very quickly, but finds the win in a second.

Code: Select all

                12     0.78   3.17   1. Kd7+ Kh7 2. Qh2+ Kg8 3. Qa2+ Kh7
                                    4. Qg2 Qf8 5. Qe4+ g6 6. Qh1+ Kg8 7.
                                    Qh4 Qf7+ 8. Kd6 Qf8+ 9. Be7 Qb8+ 10.
                                    Ke6 Qc8+ 11. Ke5 Qf5+ 12. Kd4
               12     1.29     +1   1. Kb7+!                          
               12     1.29     +3   1. Kb7+!                          
               12     1.29     +M   1. Kb7+!                          
               12     2.25  13.04   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Kc6 Ke3 6. Qh8 Kd2
                                    7. Kd5 Kd3 8. Qh7+ Kd2
               12->   2.25  13.04   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Kc6 Ke3 6. Qh8 Kd2
                                    7. Kd5 Kd3 8. Qh7+ Kd2
               13     2.37  13.14   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Qf6+ Ke3 6. Qe5+ Kf3
                                    7. Kc6 Kg4 8. Kd5 Kh4 9. Qf6+ Kh5 10.
                                    Qf5+ Kh4 <HT>
               13->   2.76  13.14   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Qf6+ Ke3 6. Qe5+ Kf3
                                    7. Kc6 Kg4 8. Kd5 Kh4 9. Qf6+ Kh5 10.
                                    Qf5+ Kh4 <HT> (s=3)
               14     3.03  13.24   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Qf6+ Ke3 6. Qe5+ Kf3
                                    7. Kc6 Kg4 8. Kd5 Kh4 9. Ke4 Kg4 10.
                                    Qg7+ Kh4 (s=2)
               14->   4.16  13.24   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Qf6+ Ke3 6. Qe5+ Kf3
                                    7. Kc6 Kg4 8. Kd5 Kh4 9. Ke4 Kg4 10.
                                    Qg7+ Kh4 (s=4)
               15     4.73  13.24   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Qf6+ Ke3 6. Qe5+ Kf3
                                    7. Kc6 Kg4 8. Kd5 Kf3 9. Qf6+ Ke2 10.
                                    Ke4 Kd1 11. Qd8+ Ke1 (s=3)
               15->   7.39  13.24   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Qf6+ Ke3 6. Qe5+ Kf3
                                    7. Kc6 Kg4 8. Kd5 Kf3 9. Qf6+ Ke2 10.
                                    Ke4 Kd1 11. Qd8+ Ke1 (s=4)
               16     8.93  13.44   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Kc6 Kf3 6. Kd5 Ke3
                                    7. Qg3+ Kd2 8. Qe5 Kc2 9. Qe3 Kd1 <HT>
                                    (s=3)
               16->  15.26  13.44   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Kc6 Kf3 6. Kd5 Ke3
                                    7. Qg3+ Kd2 8. Qe5 Kc2 9. Qe3 Kd1 <HT>
                                    (s=4)
               17    19.94  13.64   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Kc6 Kf3 6. Kd5 Kf4
                                    7. Qh6+ Kf3 8. Qh4 Kg2 9. Ke4 Kg1 10.
                                    Qf4 Kg2 <HT> (s=3)
               17->  35.89  13.64   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Kc6 Kf3 6. Kd5 Kf4
                                    7. Qh6+ Kf3 8. Qh4 Kg2 9. Ke4 Kg1 10.
                                    Qf4 Kg2 <HT> (s=4)
               18    45.41  13.64   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Kc6 Kf3 6. Kd5 Kf4
                                    7. Qh6+ Kf3 8. Qh4 Kg2 9. Ke4 Kg1 10.
                                    Qf4 Kh1 11. Qf8 Kg2 12. Qf3+ Kg1 (s=3)
               18->   1:26  13.64   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Kc6 Kf3 6. Kd5 Kf4
                                    7. Qh6+ Kf3 8. Qh4 Kg2 9. Ke4 Kg1 10.
                                    Qf4 Kh1 11. Qf8 Kg2 12. Qf3+ Kg1 (s=4)
               19     1:26     +1   1. Kb7+!                          
               19     2:41  13.64   1. Kb7+ Kh7 2. Qh2+ Kg6 3. Qxh8 Kxg5
                                    4. Qxg7+ Kf4 5. Kc6 Kf3 6. Kd5 Kf4
                                    7. Qh6+ <HT> (s=3)
              time=3:02  mat=2  n=3748870816  fh=90%  nps=20.5M
              extensions=404.3M qchecks=436.7M reduced=391.1M pruned=1292.3M
              predicted=0  evals=1287.8M  50move=0  EGTBprobes=0  hits=0
Top
User avatar
AdminX
Posts: 6363
Joined: Mon Mar 13, 2006 2:34 pm
Location: Acworth, GA

Re: Clever study

Post by AdminX »

Analysis by Stockfish 1.5 JA 64bit:

1.Kb7+ Kh7 2.Qh2+ Kg6 3.Qxh8 Kxg5 4.Qxg7+ Kf4 5.Kc6 Ke3 6.Qg4 Kd2 7.Kc5 Ke3 8.Kc4 Kd2 9.Qf4+ Ke2 10.Kc3 Ke1 11.Kd3 Kd1 12.Qf1#
+- (16.40) Depth: 6 00:00:02 5kN
+- (#12) Depth: 34 00:26:42 7915mN
"Good decisions come from experience, and experience comes from bad decisions."
__________________________________________________________________
Ted Summers
Top
Jack Lad
Posts: 8557
Joined: Wed Mar 08, 2006 10:01 pm
Location: UK

Re: Clever study

Post by Jack Lad »

AdminX wrote:Analysis by Stockfish 1.5 JA 64bit:

1.Kb7+ Kh7 2.Qh2+ Kg6 3.Qxh8 Kxg5 4.Qxg7+ Kf4 5.Kc6 Ke3 6.Qg4 Kd2 7.Kc5 Ke3 8.Kc4 Kd2 9.Qf4+ Ke2 10.Kc3 Ke1 11.Kd3 Kd1 12.Qf1#
+- (16.40) Depth: 6 00:00:02 5kN
+- (#12) Depth: 34 00:26:42 7915mN
Black is supposed to play 2...Kg8 inorder to protect the queen on h8.

How about this similar position:
[d] 4k2q/1K4p1/8/6B1/8/8/5Q2/8 w - - 0 1
White to play and win.
Now cracks a noble heart.—Good night, sweet Princess, And flights of angels sing thee to thy rest!
Top
Vinvin
Posts: 5309
Joined: Thu Mar 09, 2006 9:40 am
Full name: Vincent Lejeune

Re: Clever study

Post by Vinvin »

I suppose the main problem is in this line for crafty, after this moves there's a zugzwang after 4.Qf7! :

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Nouvelle partie"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "1QK3kq/6p1/8/6B1/8/8/8/8 w - - 0 1"]
[PlyCount "6"]

1. Kb7+ Kh7 2. Qh2+ Kg8 3. Qa2+ Kh7 *
Top
yanquis1972
Posts: 1766
Joined: Wed Jun 03, 2009 12:14 am

Re: Clever study

Post by yanquis1972 »

at the position of interest stockfishes switches from kg8 to kg6 --

[Mate in 11] d=21 2...Kg6 3.Qxh8 Kxg5 4.Qxg7+ Kf4 5.Kc6 Kf3 6.Kd5 Kf4 7.Qd4+ Kf3 8.Qe5 Kf2 9.Ke4 Kg2 10.Ke3 Kg1 11.Qg5+ Kh1 12.Kf2 Kh2 13.Qg2# (0:00:06) 34947kN
[Mate in 11] d=20 2...Kg6 3.Qxh8 Kxg5 4.Qxg7+ Kf4 5.Kc6 Kf3 6.Kd5 Kf4 7.Qd4+ Kf3 8.Qe5 Kf2 9.Ke4 Kg2 10.Ke3 Kg1 11.Qg5+ Kh1 12.Kf2 Kh2 13.Qg2# (0:00:03) 20535kN
[Mate in 11] d=19 2...Kg6 3.Qxh8 Kxg5 4.Qxg7+ Kf4 5.Kc6 Kf3 6.Kd5 Kf4 7.Qd4+ Kf3 8.Qe5 Kf2 9.Ke4 Kg2 10.Ke3 Kg1 11.Qg5+ Kh1 12.Kf2 Kh2 13.Qg2# (0:00:02) 13704kN
[Mate in 11] d=18 2...Kg6 3.Qxh8 Kxg5 4.Qxg7+ Kf5 5.Qd4 Kg6 6.Qg4+ Kf6 7.Qh5 Ke6 8.Qg5 Kf7 9.Kb6 Kf8 10.Kc6 Kf7 11.Kd6 Kf8 12.Ke6 Ke8 13.Qe7# (0:00:02) 10288kN
[Mate in 11] d=17 2...Kg6 3.Qxh8 Kxg5 4.Qxg7+ Kf5 5.Qd4 Kg5 6.Qe5+ Kg4 7.Kc6 Kf3 8.Kd5 Kf2 9.Ke4 Kg2 10.Ke3 Kg1 11.Qg5+ Kh1 12.Kf2 Kh2 13.Qg2# (0:00:01) 8322kN
[Mate in 10] d=17 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Qh4 Kf5 7.Qf4+ Kg6 8.Be7 Kh7 9.Qg5 Kg8 10.Qh5 g6 11.Qxg6+ Kh8 12.Bf6# (0:00:01) 5569kN
[Mate in 14] d=16 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Bh4 Kf5 7.Qxg7 Ke4 8.Qc3 Kf4 9.Qg3+ Kf5 10.Qf3+ Kg6 11.Be7 Kh7 12.Qf5+ Kh8 13.Bf6+ Kg8 14.Qg6+ Kf8 15.Qg7+ Ke8 16.Qe7# (0:00:00) 3327kN
[+93.57] d=15 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Bh4 Kf5 7.Qxg7 Ke4 8.Qg3 Kd4 9.Qd6+ Kc3 10.Qd1 Kc4 11.Qf1+ Kb4 12.Be7+ Ka4 13.Qc4+ Ka5 14.Bd8# (0:00:00) 1355kN
[+93.57] d=14 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Bh4 Kf5 7.Qxg7 Ke4 8.Qg3 Kd4 9.Qd6+ Kc3 10.Bf6+ Kb3 11.Qd3+ Kb4 12.Be7+ Ka4 13.Qc4+ Ka5 14.Bd8# (0:00:00) 590kN
[+93.46] d=13 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Be7 Kf7 7.Qf8+ Ke6 8.Qxg7 Kf5 9.Qd4 Ke6 10.Qh4 Kd7 11.Qf6 (0:00:00) 193kN
[+93.36] d=12 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Be7 Kf7 7.Qf8+ Ke6 8.Kc6 Ke5 9.Qxg7+ Ke4 10.Qg2+ Ke3 11.Kd5 Kd3 (0:00:00) 102kN
[+93.31] d=11 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Be7 Kf7 7.Qf8+ Ke6 8.Kc6 Ke5 9.Qxg7+ Ke4 10.Qg3 Kd4 (0:00:00) 37kN
[+93.31] d=10 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Be7 Kf7 7.Qf8+ Ke6 8.Kc6 Ke5 9.Qxg7+ Ke4 10.Qg4+ Kd3 11.Kd5 Ke3 (0:00:00) 23kN
[+89.04] d=9 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Kc6 Kxg5 7.Qxg7+ Kf4 8.Qf6+ Kg3 9.Kd5 Kg2 10.Ke4 Kg3 11.Qf7 Kg2 12.Kd4 Kg3 13.Qf5 Kh2 14.Qg4 Kh1 15.Ke3 Kh2 16.Kf2 (0:00:00) 1kN
[+89.04] d=8 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Kc6 Kxg5 7.Qxg7+ Kf4 8.Qf6+ Kg3 9.Kd5 Kg2 10.Ke4 Kg3 11.Qf7 Kg2 12.Kd4 Kg3 13.Qf5 Kh2 14.Qg4 Kh1 15.Ke3 Kh2 16.Kf2 (0:00:00) 1kN
[+89.04] d=7 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Kc6 Kxg5 7.Qxg7+ Kf4 8.Qf6+ Kg3 9.Kd5 Kg2 10.Ke4 Kg3 11.Qf7 Kg2 12.Kd4 Kg3 13.Qf5 Kh2 14.Qg4 Kh1 15.Ke3 Kh2 16.Kf2 (0:00:00) 1kN
[+89.04] d=6 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Kc6 Kxg5 7.Qxg7+ Kf4 8.Qf6+ Kg3 9.Kd5 Kg2 10.Ke4 Kg3 11.Qf7 Kg2 12.Kd4 Kg3 13.Qf5 Kh2 14.Qg4 Kh1 15.Ke3 Kh2 16.Kf2 (0:00:00) 1kN
[+16.40] d=5 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Kc6 Kxg5 7.Qxg7+ Kf4 8.Qf6+ Kg3 9.Kd5 Kg2 10.Ke4 Kg3 11.Qf7 Kg2 12.Kd4 Kg3 13.Qf5 Kh2 14.Qg4 Kh1 15.Ke3 Kh2 16.Kf2 (0:00:00) 1kN
[+16.20] d=4 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Qh4 Kf5 7.Qf4+ Kg6 8.Be7 Kh7 9.Qf5+ Kh8 10.Qh3+ Kg8 11.Qh5 g6 12.Qxg6+ Kh8 13.Bf6# (0:00:00) 0kN
[+16.08] d=3 2...Kg8 3.Qa2+ Kf8 4.Qa8+ Kf7 5.Qxh8 Kg6 6.Qh4 Kf5 7.Qf4+ Kg6 8.Be7 Kh7 9.Qf5+ Kh8 10.Qh3+ Kg8 11.Qh5 g6 12.Qxg6+ Kh8 13.Bf6# (0:00:00) 0kN

dont think its a result of lack of understanding or a design flaw, just trying desparately to stave off mate
Top
bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: Clever study

Post by bob »

Vinvin wrote:I suppose the main problem is in this line for crafty, after this moves there's a zugzwang after 4.Qf7! :

[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Nouvelle partie"]
[Black "?"]
[Result "*"]
[SetUp "1"]
[FEN "1QK3kq/6p1/8/6B1/8/8/8/8 w - - 0 1"]
[PlyCount "6"]

1. Kb7+ Kh7 2. Qh2+ Kg8 3. Qa2+ Kh7 *
that didn't seem to be the issue. It finds Kb7+ after 1 second. Finding the mate is harder, probably due to some quiet moves that get reduced. I'll try to run this again later to let it actually find the mate and see what might be an issue along the critical path.
Top
User avatar
rvida
Posts: 481
Joined: Thu Apr 16, 2009 12:00 pm
Location: Slovakia, EU

Re: Clever study

Post by rvida »

Critter 0.42 finds the move quickly at ply 5. After 19 seconds finds a mate in 18, after a minute mate in 12

Code: Select all

 2  00:00       288       0 +0.58 Kc8d7+ Kg8h7 Qb8e5
 3  00:00      1372       0 +0.55 Kc8d7+ Kg8h7 Qb8b1+ g7g6 Qb1e4
 4  00:00      2823       0 +0.60 Kc8d7+ Kg8h7 Qb8b1+ g7g6 Qb1h1+ Kh7g8 Qh1d5+ Kg8g7
 5  00:00      5943       0 +0.55 Kc8d7+ Kg8h7 Qb8b1+ g7g6 Qb1h1+ Kh7g8 Qh1d5+ Kg8h7 Qd5e4
 5+ 00:00      6463       0 +10.36 Kc8b7+
 5+ 00:00      6497       0 +11.44 Kc8b7+
 5  00:00      7957       0 +11.92 Kc8b7+ Kg8h7 Qb8h2+ Kh7g6 Qh2xh8 Kg6xg5 Qh8xg7+ Kg5h4 Qg7d4+ Kh4h3

18  00:19  21615282 1106716  +M18 Kc8b7+ Kg8h7 Qb8h2+ Kh7g8 Qh2a2+ Kg8f8 Qa2a8+ Kf8f7 Qa8xh8 Kf7g6 Bg5d2 Kg6f6 Bd2c3+ Kf6g5 Qh8xg7+ Kg5f4 Qg7f6+ Kf4e4 Qf6f2 Ke4d3 Qf2f3+ Kd3c2 Bc3b4 Kc2b2 Qf3c3+ Kb2b1 Qc3d3+ Kb1a1 Bb4c3+ Ka1a2 Qd3c2+ Ka2a3 Qc2b2+ Ka3a4 Qb2b4+

23  01:04  70540454 1097376  +M12 Kc8b7+ Kg8h7 Qb8h2+ Kh7g6 Qh2xh8 Kg6xg5 Qh8xg7+ Kg5f4 Kb7c6 Kf4e3 Kc6d5 Ke3f3 Qg7g5 Kf3e2 Kd5e4 Ke2f2 Qg5g6 Kf2e2 Qg6g2+ Ke2d1 Ke4d3 Kd1c1 Qg2c2+
Top

Return to “Computer Chess Club: General Topics”