Many chess experts and commentators have noted that the 58th move in the Kasparov vs. The World event was the crucial move in deciding the game. The World had a choice between Qe4 or Qf5, choosing the former. Many felt that Qf5 was a better move, but Kasparov has shown that even in this case he would have been able to force the g-pawn through to make a queen. Following is Garry's analysis of this position with additional commentary by Danny King.

-- Internet Gaming Zone

Analysis of 58...Qf5 (instead of 58...Qe4).

Garry Kasparov has provided analysis to prove he was winning after 58...Qf5. This is a terrifically difficult position to understand. As Garry said, "This position has more to do with geometry and mathematics than chess." It is hard to bring logic to bear on this position.

I will give the main line of analysis as provided by the World Champion, and point out a couple of the key ideas. For the fine detail, check out the full analysis at the end of this article, and be sure to visit the Club Kasparov Web site for future developments.

58 ..Qf5 59 Kh6 Qe6 60 Qd1+ Kb2 61 Qd2+ Kb1 62 Qd4

This is the first key idea: White gives Black the move. We have had this position before -- with the difference that this time Black is to move. Black's problem is that whatever move he makes will compromise his position. Using chess jargon, we say that Black is in "Zugzwang" -- from the German meaning "compulsion to move."

The two main alternatives in this position, 62...Ka2 and 62...Kc2, both have shortcomings (62...Kc2 loses more quickly -- see the full analysis).

62..Ka2 63 Kg5 Qe7+ 64 Qf6 Qe3+ 65 Qf4 Qg1+ 66 Kf6 Qb6+ 67 Kf7! Qb7+ 68 Kg8!

This is the next key idea. The king moves in front of the g-pawn again, allowing White's queen access to the f7 square. In many situations, this prevents Black from finding counterplay by advancing the d-pawn as White can exchange the queens with Qf7 or give a killing check. That is the main drawback of the position of Black's king on a2.

68..Qc8+ 69 Qf8 Qe6+ 70 Kg7 Qe5+ 71 Qf6 Qc7+ 72 Qf7 Qc3+ 73 Kf8 Qc8+ 74 Qe8 Qf5+ 75 Ke7 Qg5+ 76 Kd7 d4 77 Qf7+ Ka1 78 g7 Qb5+ 79 Kc7 Qc5+ 80 Kb7 Qb5+ 81 Ka8 Qc6+ 82 Qb7 Qe8+ 83 Ka7 Qg8 84 Qa6+ Kb2 85 Qb5+ Kc3 86 Qc5+ Kd3 87 Qf8 Qa2+ 88 Kb8 Qh2+ 89 Kc8 Qh3+ 90 Kd8 Qh4+ 91 Qe7 and wins as the pawn finally goes through. For instance 91...Qh7 92 Qa3+ Ke4 93 Qf8 Qh4 94 Qe7+ forcing the exchange of queens with a winning position, known to theory.

Delicate stuff.

-- Danny King

Check out the full analysis from Garry below.

58 ..Qf5 59 Kh6

[59 Qf6
A) 59 ..Qg4 60 Qb6+ Kc1 61 Kf7 Qf5+ 62 Ke7 Qe5+ 63 Qe6 Qc7+ (63 ..Qg3 64 Qd6 Qg4 65 Qf6 Qe2+ 66 Kf8+-; 63 ..Qg7+ 64 Qf7 Qe5+ 65 Kd7 Qe4 66 g7 Qa4+ 67 Ke6 Qa6+ 68 Kf5 Qf1+ 69 Kg6 Qg2+ 70 Kh6 Qd2+ 71 Kh7 Qh2+ 72 Kg8 Qe5 73 Qf1+ Kc2 74 Qf2++- Kb3 75 Kf7 Qc7+ 76 Kg6+-) 64 Kf6 Qf4+ 65 Qf5 Qd6+ 66 Kg5 Qg3+ 67 Kh6 Qd6 68 Qg5+ Kb1 (68 ..Kc2 69 Qg2+ Kc3 70 Kh7 d4 71 g7 Qc7 72 Kh6 Qd6+ 73 Kh5 Qe5+ 74 Kh4+-) 69 Qg1+ Kc2 70 Kh7 Qe5 71 Qf2+ (71 Qg2+) 71 ..Kb1 72 Qb6+ Ka2 73 g7 Qf5+ (73 ..Qh5+ 74 Qh6 Qf5+ 75 Qg6) 74 Qg6 Qh3+ 75 Qh6 Qf5+ 76 Kh8 Qe5;
B) 59 ..Qd7+ 60 Qf7 (60 Kh6 Qh3+ 61 Kg5; 60 Kf8 Qc8+ 61 Ke7) 60 ..Qg4 B1) 61 Qb7+ Kc1 62 Qc6+ Qc4; B2) 61 Qf1+ Kc2 B2a) 62 Kf6 d4 63 Qc4+ Kd2 64 Qb4+ (64 Qd5 Qf4+ 65 Qf5 Qd6+ 66 Kg5 Qg3+ 67 Kh6 Qd6 68 Qf2+ Kc1 69 Kh7 d3 70 g7 Qd7 71 Qe3+ Kb2) 64 ..Kd1; B2b) 62 Qf2+ 62 ..Kc1; B3) 61 Kf8 B3a) 61 ..d4 62 g7 (62 Qf1+ Kc2 63 Qf2+ Kc3 64 g7 Qc8+ 65 Kf7 Qc4+=) 62 ..Qc8+ 63 Ke7 Qb7+ 64 Kf6 Qf3+ 65 Kg6 Qg2+= 66 Kh5 Qh3+ 67 Kg5 Qg3+ 68 Kh6 Qe3+ 69 Kh7 Qh3+ 70 Kg8 d3; B3b) 61 ..Qc8+; B3c) 61 ..Qb4+ ;

59 Qb6+!? Interesting attempt.
A) 59 ..Kc2 60 Qf6! D 60 ..Qd7+ 61 Kf8 Qc8+ (61 ..d4 62 g7 Qc8+ 63 Kf7 Qd7+ 64 Kg6 Qe8+ 65 Kh7 Qd7 66 Kh6 Qh3+ 67 Kg6+-) 62 Ke7 Qb7+ 63 Ke6 A1) 63 ..Qb6+ 64 Ke5! 64 ..Qe3+ (64 ..Qb8+ 65 Kf5; 64 ..Qb2+ 65 Kf5+-) 65 Kxd5; A2) 63 ..Qa6+ 64 Kf7! Qa7+ 65 Qe7 Qf2+ 66 Ke8 Qf5 67 g7+- Qg4 (67 ..Qg6+ 68 Kd7 Kd1 69 Qf8 Qg4+ 70 Kd8 Qh4+ 71 Qe7+-) 68 Qe5 d4 69 Kf7 Qf3+ 70 Ke6 Qc6+ 71 Ke7 Qg2 72 Qxd4+-;
B) 59 ..Kc1!
B1) 60 Qf6 Qd7+ (60 ..Qe4 61 Qf1+ Kb2 62 Qf2+ GAME) B1a) 61 Kf8 Qc8+ 62 Ke7 Qb7+ 63 Ke6 (63 Kd8 Qb8+ 64 Kd7) 63 ..Qc6+ 64 Kf5 Qc2+ 65 Kg5 Qg2+ 66 Kh6 (66 Kh5 Qe2+ 67 Kh4 Qh2+) 66 ..Qh3+ 67 Kg7 Qd7+; B1b) 61 Kh6 Qh3+ 62 Kg5 Qg2+ 63 Kf4; B1c) 61 Qf7 61 ..Qg4 62 Qf1+ (62 Kf8 Qc8+) 62 ..Kc2 63 Qf2+ Kc1;
B2) 60 Qe3+ B2a) 60 ..Kd1 61 Kh6 (61 Qd4+ Kc2) 61 ..Qf6; B2b) 60 ..Kb2 61 Qd2+ Ka1 (61 ..Kb1) ; B2c) 60 ..Kb1 B2c1) 61 Kh6 Qf6 (61 ..d4 62 Qg1+ Ka2 63 g7 Qe6+ 64 Qg6 Qe3+ 65 Kh5+-) 62 Qg1+ Kb2 63 Qg2+ Kb1= 64 Qh1+ Kc2 65 Qh2+ Kb1 66 Kh7 Qf5 67 Qg1+ Kc2 68 Qd4 Kb1; B2c2) 61 Qb3+ Ka1 62 Qb6 d4; B2c3) 61 Qd4!! B2c31) 61 ..Kc2 62 Qf6!; B2c32) 61 ..Qe6 62 Qg1+ Kc2 63 Qg2+ B2c321) 63 ..Kb1 64 Qf1+ (64 Kh7 Qf5) 64 ..Ka2 (64 ..Kc2 65 Qf6 Qg4 66 Kf7 Qd7+ 67 Kf8+-) 65 Qf6; B2c322) 63 ..Kb3 64 Qf3+ Kc4 65 Kh7+-; B2c33) 61 ..Ka2 62 Qf6 Qd7+ (62 ..Qg4! 63 Qa6+ Kb1 64 Qb6+ Kc2 65 Kf7 Qf5+ 66 Ke7+-) 63 Qf7 A1 B2c331) 63 ..Qd8 64 Qa7+ Kb2 65 Qb7+ Kc2 66 Kf7; B2c332) 63 ..Qd6 64 Kh7 (64 Qf2+ Kb3 65 Kh7 Qd7+ 66 g7 d4) 64 ..Qh2+ 65 Kg8 Qe5 66 g7 Qb8+ 67 Qf8 Qb6 68 Qf4! Qe6+ 69 Kf8 Qc8+ 70 Ke7 Qb7+ 71 Kf6 Qc6+ 72 Kg5 Qe8 73 Qd2+; B2c333) 63 ..Qg4 64 Kf6 Qf4+ 65 Ke6 Qg4+ 66 Kxd5; B2c34) 61 ..Kc1 62 Kh6 Qh3+ 63 Kg5 Qg3+ 64 Kf6+- Qf3+ 65 Ke7+-; B2c35) 61 ..Qd7+! 62 Kf6 Qc6+ (62 ..Qd6+ 63 Kg5 Qe7+ 64 Qf6 Qe3+ 65 Qf4 Qe7+ 66 Kh6 Qe6 67 Qf3 d4 68 Kh7 Qd7+ 69 g7 d3 70 Kh8 Qd4=) 63 Kg5 Qc1+ 64 Qf4 Qc3 65 Qf5+ Kc1 (65 ..Ka2 66 Kg4) ]

59 ..Qe6 60 Qd1+

[60 Qd3+ Kc1 61 Kh7 (61 Qf3 d4 62 Kh7 d3 63 g7 d2 64 Qc3+ Kb1=; 61 Qc3+ Kb1 62 Qd4‡) 61 ..Qe7+ 62 g7 Qh4+ 63 Kg6 Qg4+=; 60 Qb4+ Kc2 61 Qf4!? Kb1 (61 ..d4 62 Qxd4+-) 62 Qf3 (62 Qf7 Qh3+ 63 Kg5 Qg2+ 64 Kf6 Qb2+ 65 Ke6 Qb6+=; 62 Qd4!) 62 ..d4 63 Kh7 Qd7+ 64 g7 d3=; 60 Kg5 Qe7+ 61 Qf6 Qe3+ 62 Qf4 Qc3 63 Qf5+ Ka2]

60 ..Kb2 61 Qd2+ Kb1

[61 ..Ka1 62 Qf4 Kb1 (62 ..Kb2 63 Kg5; 62 ..Ka2 63 Qf3+- B; 62 ..Qh3+ 63 Kg5+-; 62 ..d4 63 Qxd4+ Kb1 64 Kg5 Qe7+ 65 Kf5) ]

62 Qd4 Critical position
[62 Qd3+ Kc1 63 Kh7 Qe7+ 64 g7 Qh4+ 65 Kg6 Qg4+= 66 Kf6 Qh4+ 67 Kf7 Qf4+=]

62 ..Ka2

[62 ..Kc2
A) 63 Kg7 Qd7+ (63 ..Qf5 64 Qf6; 63 ..Kb1 64 Qg1+ Kc2 65 Qg2+ Kb1 66 Qf1+ Ka2 67 Qf7) 64 Kf6 Qd6+ 65 Kf5 Qd7+ 66 Kg5 Qe7+ 67 Qf6 (67 Kh5 Qe2+ 68 Kh4) 67 ..Qe3+ 68 Qf4 Qe7+ 69 Kh6 Qe6 70 Qf2+ Kb1 71 Qf3 d4;
B) 63 Kg5! Qe7+
B1) 64 Kh5 B1a) 64 ..Qe8 65 Qf2+ (65 Qf6 Qe2+; 65 Qc5+ Kb1 66 Qd6 d4) 65 ..Kc3 66 Qf3+ Kc2; B1b) 64 ..Qe2+ 65 Qg4 Qe5+ 66 Qg5 Qh8+ (66 ..Qh2+ 67 Kg4 Qe2+ 68 Kh3 Qe8 69 g7 Qg8 70 Kg3+-) 67 Kg4 Qg7 68 Qf5+ Kb2;
B2) 64 Qf6! Qe3+
B2a) 65 Qf4 B2a1) 65 ..Qc3 66 Qf5+ (66 Kf5 Qc8+ 67 Kf6) 66 ..Kb3 (66 ..Kd1 67 Kh4 Qg7 68 Kg4 d4 69 Qf7 Qe5 70 g7 Qe4+ 71 Qf4+-) 67 Qe6 (67 Kg4 Qg7 68 Qf7 Qd4+ 69 Kf5 Qf2+ 70 Ke6 Qb6+ 71 Kxd5 Kc2=) 67 ..Kc2 68 Kf5 Qf3+ 69 Ke5 Qc3+ 70 Kd6 Qa3+ 71 Kc6 Qa6+ 72 Kd7 Qa7+ 73 Ke8 d4; B2a2) 65 ..Qe7+ 66 Kg4 B2a21) 66 ..d4 67 Qxd4+-; B2a22) 66 ..Qg7 67 Qf5+ Kc3 68 Qf3+ (68 Qf7 Qd4+) 68 ..Kc2 69 Qf7 Qd4+ 70 Kg5; B2a23) 66 ..Kc3 67 Qc1+ Kb3 68 Qb1+ Kc3 69 Qa1+ Kc2 70 g7+-; B2b) 65 Kg4! B2b1) 65 ..Qg1+ 66 Kf5 d4 (66 ..Qf2+ 67 Ke6 Qb6+ 68 Ke5 Qb8+ 69 Kf5+-) 67 g7 d3 68 Qc6+ Kd2 69 Qg6 Qc5+ 70 Ke4 Qe7+ (70 ..Qc4+ 71 Kf3 Qg8 72 Kf2 Kc1 73 Qc6+ Kd2 74 Qf6 Qa2 75 Kg3 Qd5 76 Qg6+-) 71 Kf3 Qe2+ 72 Kg3 Ke1 73 g8Q d2 74 Qf8+-; B2b2) 65 ..Qe4+ 66 Kg3 Qe3+ 67 Kg2 Qe4+ 68 Kf2 Qg4 (68 ..Qc4 69 g7 Qg4 70 Qc6++-) 69 g7; B2b3) 65 ..d4 66 g7 Qg1+ 67 Kh5 d3 68 Qc6+ Kd2 69 Kh6 Qh2+ (69 ..Qg4 70 Qd5+-) 70 Kg6 Qg1+ 71 Kh7 Qa7 72 Qd5 Kc2 73 Kh8 Qa1 74 Qc6++- Kd2 75 Qg2+ Ke3 76 Kh7 d2 77 g8Q+-]

63 Kg5 Qe7+ 64 Qf6 Qe3+ 65 Qf4 Qg1+

[65 ..Qc3 66 Kf5! (66 Qf5!?)
A) 66 ..Qg7 67 Qd2+ Kb1 68 Qd1+ Kb2 69 Qxd5;
B) 66 ..Kb3 67 Qe5 Qc8+ 68 Kg5 Qc1+ 69 Kf6 Qc6+ 70 Qe6 Qc3+ 71 Kf7 Qc7+ 72 Qe7 Qf4+ 73 Kg8 Kc2 (73 ..Kb2 74 Qf8 Qg4 75 g7 d4 76 Qb4+ Kc1 77 Qc5+ Kb2 78 Qe5+-) 74 g7 d4 75 Kh7 (75 Qf8) 75 ..Qf5+ 76 Kh6 Qh3+ 77 Kg6 Qd3+ 78 Kf7 Qf5+ 79 Qf6 Qd7+ 80 Kg6 Qe8+ 81 Kh7 Qd7 82 Kh6 Qh3+ 83 Kg6 Qg2+ 84 Qg5 Qc6+ 85 Kh7+-;
C) 66 ..Kb1 67 Qf1+ Kb2 68 Qg2+ Ka1 69 g7 Qc8+ 70 Kg5 Qd8+ 71 Kh6 Qd6+ 72 Qg6 Qh2+ 73 Qh5 Qf4+ 74 Qg5 Qh2+ 75 Kg6+-;
D) 66 ..Ka3 67 Qe5 Qc8+ 68 Kg5 Qc1+ 69 Kf6 Qc6+ 70 Kf7 d4 71 g7+-;
E) 66 ..Qc8+ 67 Kf6 Qc6+ (67 ..Qf8+ 68 Kg5 Qe7+ 69 Kh6 Qe6 70 Qf3; 67 ..Qd8+ 68 Kf7 Qd7+ 69 Kg8 Qe6+ 70 Qf7 Qc8+ 71 Qf8 Qe6+ 72 Kg7 A) 68 Kf7 (68 Kg5 Qc3) E1) 68 ..Qd7+ 69 Kg8 Qc8+ 70 Qf8 Qe6+ 71 Kg7 A(71 Kh7 Qh3+) ;
E2) 68 ..d4 69 g7! (69 Qxd4=) 69 ..Qd5+ 70 Kf6 d3 71 Qg4 E2a) 71 ..Qc6+ E2a1) 72 Ke5 Qc5+ 73 Ke4 E2a11) 73 ..Qc4+ 74 Kf3 Qg8 75 Ke3 E2a111) 75 ..Ka3 76 Kxd3+-; E2a112) 75 ..Ka1 76 Qd4+ (76 Kxd3 Qb3+=) 76 ..Ka2 (76 ..Kb1 77 Kxd3) 77 Kxd3; E2a113) 75 ..Kb1 76 Kxd3+-; E2a12) 73 ..Qc6+ 74 Kxd3+-; E2a2) 72 Kf5 72 ..Qc8+ 73 Kf4 Qc7+ 74 Kf3 Qb7+ 75 Ke3 Qb6+ 76 Qd4+-; E2b) 71 ..Qd8+ 72 Kf5 Qd7+ 73 Kf4+-; E2c) 71 ..Qd6+ 72 Kf5 Qd5+ 73 Kf4 Qd6+ 74 Ke3+-; E2d) 71 ..d2 72 g8Q d1Q 73 Qg2++-; 65 ..Qe7+ 66 Kh6 Qe6 67 Qf3+- B 67 ..Qd6 68 Qg2+ Kb1 69 Kh7 Qe5 70 Qh1+ Kc2 71 g7 Qf5+ 72 Kh8 Qf6 73 Qg2+ Kb3 74 Qh3+ Kc2 75 Kh7+-]

66 Kf6

[66 Kh5!?
A) 66 ..Qh1+ 67 Kg4 Qg2+ 68 Qg3 A1) 68 ..Qe4+ 69 Kh3 Qe6+ 70 Kh2 d4 71 Qg5 Qg8 72 g7 d3 73 Qd2+ Ka1 74 Qc3+ Ka2 75 Qd4 Qb8+! (75 ..Qf7 76 Kg3 Qb3 77 Kf4+-) 76 Kh3 Qb3 77 Kh4+-; A2) 68 ..Qb2! 69 Qf3;
B) 66 ..d4 67 Qf7+ Kb2 68 Qb7+ Ka1 69 g7 Qh2+ 70 Kg4 Qe2+ 71 Qf3 Qe6+ 72 Qf5 Qe1 73 Kg5 Qc1+ 74 Kf6 Qc6+ 75 Qe6 Qf3+ 76 Ke7 Qb7+ 77 Qd7 Qe4+ 78 Kd6+- Qg6+ 79 Kc7 Qg3+ 80 Kc8 Qc3+ 81 Qc7 Qh3+ 82 Kd8 Qh4+ 83 Qe7 Qg3 84 Qa7+ Kb1 85 Qxd4;
C) 66 ..Qd1+ 67 Kh4 (67 Qg4 Qh1+ 68 Qh4 Qf3+ 69 Kh6 Qe3+ 70 Kh7 Qd3 71 Qg4) 67 ..Qh1+ 68 Kg4 Qg2+ 69 Qg3 Qb2! 70 Qf3 (70 Qc7; 70 Kf5 Qc2+ 71 Kf6 Qc6+) ]

66 ..Qb6+ 67 Kf7! Key idea 67 ..Qb7+ 68 Kg8! Qc8+ 69 Qf8 Qe6+ 70 Kg7 Qe5+

[70 ..Kb1 71 Qf1+ Ka2 (71 ..Kc2 72 Qf6 Qd7+ 73 Kf8+-) 72 Qf6 (72 Qf7 Qg4)
A) 72 ..Qg4 73 Qa6+ Kb1 74 Qb6+ A1) 74 ..Kc2 75 Kf7 A1a) 75 ..Qf4+ 76 Qf6 (76 Ke7 Qe4+ 77 Qe6 Qb4+ 78 Kf6 Qh4+ 79 Ke5 Qe4+ 80 Kd6 Qd4 81 Qxd5=) 76 ..Qc7+ 77 Ke6 Qb6+ (77 ..Qc6+ 78 Kf5+-) A1a1) 78 Kf5 Qf2+ 79 Ke5 Qe3+ (79 ..Qg3+ 80 Kxd5+-; 79 ..Qe2+ 80 Kxd5=) 80 Kxd5+-; A1a2) 78 Ke5! 78 ..Qb8+ (78 ..Qc7+ 79 Kf5 Qd7+ 80 Kg5+-; 78 ..Qb2+ 79 Kf5+-; 78 ..Qe3+ 79 Kxd5+-) 79 Kf5 (79 Kxd5=) 79 ..Qc8+ 80 Kg5+-; A1b) 75 ..Qf5+ 76 Ke7 Qe5+ 77 Qe6 Qc7+ (77 ..Qg7+ 78 Qf7 Qe5+ 79 Kd7+-) 78 Kf6 Qc3+ 79 Qe5 Qc6+ 80 Kg5+-;
A2) 74 ..Ka2 75 Kf7 A2;
B) 72 ..Qd7+ 73 Qf7 A1 73 ..Qg4 74 Qa7+ Kb3 75 Qb6+ Ka2 76 Kf7 A2
B1) 76 ..Qf5+ 77 Ke7 Qe5+ 78 Qe6 Qc7+ 79 Ke8 Qb8+ 80 Kf7! B1a) 80 ..Qc7+ 81 Qe7 Qf4+ 82 Kg8 (82 Qf6) ; B1b) 80 ..Qf4+ 81 Qf6 Qc7+ 82 Qe7 Qf4+ 83 Kg8 Qb8+ 84 Qf8+- Qe5 85 g7+-;
B2) 76 ..Qf4+ 77 Qf6 ; 70 ..Qd7+ 71 Qf7 A1ž; 70 ..Qe4 71 Qf2+ Ka1 72 Kf6+-]

71 Qf6 Qc7+

[71 ..Qe4 72 Qf2++-]

72 Qf7 Qc3+

[72 ..Qd8 73 Qa7++-;
72 ..Qe5+ 73 Kg8 Qb8+ 74 Qf8 Qe5
A) 75 Qa8+!? Kb1 76 Qb7+ Kc2 (76 ..Ka2 77 Qa6+ Kb1 78 g7 Qf5 79 Qb6+ Kc2 80 Qc7+ Kb1 81 Qh2+-) 77 Qc6+;
B) 75 Qf3;
C) 75 Qf2+ Kb1 (75 ..Kb3 76 Qf3+ Kc4 77 g7 d4 78 Kh7 Qh2+ 79 Kg6 Qd6+ 80 Qf6 Qg3+ 81 Qg5+-) 76 Qf3 (76 g7 Qe8+ 77 Qf8 Qe6+ 78 Kh7 Qh3+ 79 Kg6 Qg4+ 80 Kf6 Qf3+ 81 Ke6 Qe3+=) ;
D) 75 g7
D1) 75 ..Qe6+! 76 Kh7 D1a) 76 ..Qe4+ 77 Kh6 Qe3+ 78 Kg6 Qe6+ 79 Qf6 Qg4+ 80 Kh7 Qh5+ 81 Qh6 Qf5+ 82 Kh8 Qe5 83 Qg6 Qh2+ 84 Kg8 Qb8+ (84 ..d4 85 Kf8 Qb8+ 86 Qe8 Qd6+ 87 Qe7 Qb8+ 88 Kf7 Qf4+ 89 Ke6 Qg4+ 90 Kd6 Qg3+ 91 Kd7 Ka1 92 Qf7 Qg4+ 93 Kc7 Qg3+ 94 Kb7 Qg2+ 95 Ka7+-) 85 Kh7 Qh2+ 86 Qh6 Qc2+ 87 Kh8 Qc3 88 Qa6+ Kb2 89 Qb6+ Ka2 90 Qf2+ Ka3 91 Qf5 Kb2 92 Kh7 Qc7 93 Kg6 Qg3+ 94 Qg5 Qd3+ 95 Kf7+-; D1b) 76 ..Qh3+! 77 Kg6 Qg4+ 78 Kf6 Qf4+ (78 ..Qf3+ 79 Ke7 Qe3+ 80 Kf7 Qa7+ 81 Kg8+-) 79 Ke6 Qe3+ (79 ..Qe4+ 80 Kd6 Qb4+ 81 Kd7 Qa4+ 82 Kd8 Qa5+ 83 Ke7 Qa7+ 84 Ke6 Qe3+ 85 Kf7 Qf4+ 86 Kg8 Qe5) 80 Kd7 Qa7+ 81 Ke8 Qb8+ 82 Kf7 Qf4+ 83 Kg8 Qe5 84 Qf2+ Ka1 85 Kf7 Qh5+ 86 Kf8 Qh6 87 Qf5+-;
D2) 75 ..d4 76 Qa8+ Kb1 77 Qb7+ Kc1 78 Qc6+ Kb2 79 Kf7 Qf5+ 80 Qf6 Qd7+ 81 Kf8 Qc8+ 82 Ke7 Qc7+ 83 Ke6 Qc4+ (83 ..Qc6+ 84 Ke5 Qc5+ 85 Ke4 Qc2+ 86 Kf3+-) 84 Kd7 Qd5+ 85 Kc7 Qc4+ 86 Kb7 Qd5+ 87 Kb6 Qb3+ 88 Ka7 Qa2+ 89 Qa6 Qg8 90 Qb6+ Kc3 91 Qc5+ Kd3 92 Qf8 Qa2+ 93 Kb8 Qh2+ 94 Kc8 Qh3+ 95 Kd8 Qh4+ 96 Qe7 Qg4 97 Qa3+ Ke4 98 Qf8+-]

73 Kf8 Qc8+
[73 ..Qh8+ 74 Ke7 Qe5+ 75 Kd7 Qh5 76 Qf2+]

74 Qe8
[74 Ke7 Qb7+ 75 Kd6 Qb6+ 76 Ke5 Qb2+=]

74 ..Qf5+

[74 ..Qc5+ 75 Kf7 Qf2+ 76 Kg8 Qf5
A) 77 Qa4+ Kb1 78 Qb3+ (78 Qb5+ Kc2 79 Qc6+ Kd2) 78 ..Kc1 79 Qc3+ Kb1;
B) 77 g7 Kb2
B1) 78 Qe2+ Kc3 79 Qh2 d4 80 Kh8 Qf6 81 Qh5 d3 82 Kh7 Qe7 83 Qa5+ Kb3 84 Qd5+ Kc3 85 Qc6+ Kb4 86 Kg6 Qd8=;
B2) 78 Qb8+!? B2a) 78 ..Ka1 79 Qh2 d4 80 Kh8 Qf6 81 Qg1+ Ka2 (81 ..Kb2+-) 82 Kh7 Qh4+ 83 Kg6 Qe4+ 84 Kg5 Qe5+ 85 Kh6 Qe6+ 86 Qg6 Qe3+ 87 Kh5 Qh3+ 88 Kg5 Qg3+ 89 Kf5 Qf3+ 90 Ke5+-; B2b) 78 ..Ka3 79 Qf8+; B2c) 78 ..Kc3 79 Qc7+ B2c1) 79 ..Kd3 80 Qh2 Kc4 (80 ..d4 81 Qh7; 80 ..Kc3 81 Kh8 Qf6 82 Qh3+ Kb2 83 Kh7 Qe7 84 Qg2+) 81 Kh8 Qf6 82 Qh5 d4 83 Kh7 Qe7 84 Qf3+-; B2c2) 79 ..Kb4 ; B2d) 78 ..Kc1 79 Qh2! d4 (79 ..Qc8+ 80 Kh7 Qf5+ 81 Kh8 Qf6 82 Qh5 Kb2 83 Kh7 Qe7 84 Qh2+ Ka1 85 Qf4+-) 80 Kh8 Qf6 81 Qg1+ Kb2 (81 ..Kc2 82 Kh7 Qh4+ 83 Kg6 Qe4+ 84 Kg5+-) 82 Kh7 B2d1) 82 ..Qh4+ 83 Kg6 Qe4+ 84 Kg5 Qe5+ 85 Kh6 Qf6+ (85 ..Qe6+ 86 Qg6 Qe3+ 87 Kh5 Qh3+ 88 Kg5 Qg3+ 89 Kf6+-) 86 Qg6 Qf4+ 87 Qg5+-; B2d2) 82 ..Qf5+ 83 Kh6 Qe6+ 84 Qg6 Qe3+ 85 Kh5 Qh3+ 86 Kg5 Qg3+ (86 ..Qg2+ 87 Kh6+-) 87 Kf6 Qf3+ 88 Qf5 Qc6+ 89 Qe6+-;
B3) 78 Qf8 78 ..Qe6+ 79 Kh7 Qh3+ 80 Kg6 Qg4+ 81 Kf6 Qf4+ 82 Ke6 Qe3+ 83 Kf7 Qf4+ 84 Kg8 Qe5 85 Qf2+ Ka1 86 Kf7 Qh5+ 87 Kf8 Qh6 88 Qf5+-]

75 Ke7

[75 Kg8 Kb2!
A) 76 g7 d4 77 Qb8+ (77 Qf7 Qc8+ 78 Qf8 Qe6+ 79 Kh7 Qh3+ 80 Kg6 Qg4+ 81 Kf7 Qf5+ 82 Ke8 Qc8+ 83 Ke7 Qc7+ 84 Ke6 Qc4+ 85 Kf6 Qc6+) 77 ..Kc1 78 Qf8 Qe6+=;
B) 76 Qb5+ 76 ..Kc1 77 g7 Qe6+=]

75 ..Qg5+

[75 ..Qe4+ 76 Kd8
A) 76 ..Qd4
A1) 77 Qe6!? A1a) 77 ..Kb3 78 Qf7 Qh8+ (78 ..Qh4+ 79 Qe7 Qh8+ 80 Kd7 Qh3+ 81 Qe6 Qg2 82 Qf7 Qg4+ 83 Kd6+-) 79 Kd7 Qh5 80 Kd6+-; A1b) 77 ..Kb2 78 Qe2+ Kb3 79 Qf3+ Kc2 (79 ..Ka4 80 Ke8 Qe5+ 81 Kf7 Qc7+ 82 Kg8 Qc8+ 83 Kh7 Qc2 84 Kh6 Qh2+ 85 Kg5 Qe5+ 86 Qf5 Qe7+ 87 Qf6 Qe3+ 88 Qf4+ d4 89 g7 Qe7+ 90 Qf6+-) 80 Qg2+ Kb1! (80 ..Kd1 81 g7 Qb6+ 82 Ke7 Qc7+ 83 Kf6+-) ; A1c) 77 ..Kb1 78 Qf7 Qb6+ 79 Kc8 Qc6+ 80 Kb8 Qd6+ 81 Kb7 Qb4+ 82 Ka8 Qa4+ 83 Kb8 d4 84 g7+-;
A2) 77 Qe2+ 77 ..Kb3 A2a) 78 Qf3+ Kc2 79 Qg2+ Kb1! 80 g7 Qf6+ 81 Ke8 Qe6+ 82 Kf8 Qf5+ 83 Kg8 d4 84 Qh1+ Kb2 85 Qh2+ Kc3 86 Kh8 Qf6 87 Qh5 d3 88 Kh7 Qe7 89 Qa5+ Kd4 90 Qb6+ Kc3 (90 ..Ke4 91 Qf2 Qd7 92 Qh4++-) 91 Qc6+ Kb4 92 Kg6 Qd8=; A2b) 78 Qb5+! Kc2 79 Qc6+ Kd1 (79 ..Kb1 80 Qb7+ Ka2 81 g7+-) 80 Ke8! A2b1) 80 ..Qg7 81 Qa4+ Ke2 82 Qg4+ Ke1 83 Qe6+ Kd2 84 Qf7 Qh8+ 85 Ke7 Qe5+ (85 ..Qh4+ 86 Qf6 Qb4+ 87 Kf7 d4 88 g7+-) 86 Kd7 Qh5 87 Qf4+ Kd1 88 g7+-; A2b2) 80 ..Qe5+ 81 Kf7 Qf4+ (81 ..Qf5+ 82 Ke7 Qe5+ 83 Qe6; 81 ..Qh5 82 Qa4+ Ke2 83 Qf4 Kd3 84 Kf6+-) 82 Ke7 Qe5+ 83 Qe6 Kd1 A2b21) 83 ..Qg5+ 84 Qf6 Qe3+ 85 Kd8 Qg3 86 g7 Qb8+ 87 Kd7 Qb7+ 88 Ke6 Qc6+ 89 Kf5 Qc2+ 90 Kg5 Qg2+ 91 Kh6 Qh3+ 92 Kg6 Qg4+ 93 Kh7 Qh5+ 94 Qh6 Qf5+ 95 Kh8 Qe5 96 Qg6 Qh2+ 97 Kg8 Qb8+ (97 ..Qf4 98 Qh5+ Kc2 99 Kh7+-) 98 Kh7 Qh2+ 99 Qh6 Qc2+ 100 Kh8 Qc3 101 Qh5++-; A2b22) 83 ..Qg7+ 84 Qf7 Qe5+ 85 Kd7 Qh5 86 Qf1+ Kc2 87 Qg2+ Kc3 88 Qg3+ Kc4 (88 ..Kb2 89 g7 Qf7+ 90 Kc6 Qe8+ 91 Kc5 Qe7+ 92 Kb6 Qd8+ 93 Qc7+-) 89 g7 Qf7+ 90 Kd8 Qf6+ 91 Kc8 Qe6+ 92 Kb7 Qg8 93 Qg4+ Kb5 94 Qd7++-; A2b23) 83 ..Qc7+ 84 Kf6 Qf4+ 85 Qf5 Qd6+ (85 ..Qd4+ 86 Qe5+-) 86 Kf7 Qc7+ 87 Ke6 Qb6+ 88 Ke5+- Qb2+ 89 Kxd5;

B) 76 ..Qh4+ 77 Qe7 (77 Kc7 Qf4+ 78 Kb7 Qb4+ 79 Ka6 Qa3+ 80 Kb6 Qb4+ 81 Qb5 Qe4 82 Qa6+ Kb2 83 Ka7 Kc2 84 Qa2+ Kd1 85 Qa1+ Kc2 86 g7 Qe7+=) 77 ..Qh8+ 78 Kd7 Qh3+ 79 Qe6 Qc3
B1) 80 Qf7 Qh3+ 81 Kd6 Kb1 82 Qb7+ Kc2 83 Qc6+ Kb2 84 Qb6+ Kc2 (84 ..Kc3 85 Qc5++-) 85 Kxd5 Qf5+ 86 Kc4 Qd3+ 87 Kb4 Qc3+ 88 Kb5 Qd3+ 89 Ka4 Qe4+ 90 Ka5 Qe5+ 91 Ka6+-;
B2) 80 Ke8! Kb1 (80 ..Qd4 81 Qa6+ Kb1 82 Qb7+ Ka2 83 g7+-) 81 Qb6+ Kc2 82 Kf7 Qf3+ 83 Qf6 Qh5 84 Ke7 d4 85 g7+-; 75 ..Qg4 76 Qa8+ Kb2 77 Qb7+ Kc1 78 Qc6+ Kb1 79 Qb6+ Kc1 80 Qf6 Qe4+ (80 ..Qb4+ 81 Kf7+-) 81 Kf8+-]

76 Kd7

[76 Kd6!?
A) 76 ..Qg3+ 77 Kd7 A1) 77 ..Qg4+ 78 Qe6 Qa4+ (78 ..Qg1 79 Kc6 Kb1 80 Qf5+ Kc1 81 Qf7+-; 78 ..Qd4 79 Kc6 Kb2 80 Qe2+ Kc3 81 Qf3+ Kb2 82 Qg2+ Ka1 83 g7 Qa4+ 84 Kd6 Qb4+ 85 Ke6 Qb6+ 86 Kf5 Qb1+ 87 Kg5 Qb8; 78 ..Qg2 79 Qf7 Qg4+ 80 Kd6 Ka3 81 Kc7+-) 79 Kd6 Qb4+ 80 Kxd5; A2) 77 ..Kb1 78 Qf7 Qh3+ A2a) 79 Qe6 Qg2 80 Qf5+ Kc1 (80 ..Ka2 81 Qf7) 81 Qf6 d4 82 g7 Qd5+; A2b) 79 Kc7 A2b1) 79 ..Qh2+! 80 Kc6 Qc2+ 81 Kd6 (81 Kb7 Qb2+) 81 ..Qh2+! 82 Ke7 Qc7+; A2b2) 79 ..Qc3+ 80 Kd8 A2b21) 80 ..Qa5+ 81 Qc7 Qa8+ 82 Ke7 Qa3+ (82 ..d4 83 Qb6+ Kc1 84 Qc5+ Kb1 85 g7+-) 83 Ke8 Qa4+ 84 Kf7 Qb3 85 g7 d4+ 86 Kf8 Qf3+ 87 Ke8 Qe4+ (87 ..Qa8+ 88 Qd8 Qe4+ 89 Qe7+-) 88 Qe7 Qg6+ 89 Kd8+-; A2b22) 80 ..Qh8+ 81 Ke7 Qe5+ 82 Kd7 Qh5 83 Qf1+ Kb2 84 Qg2+ Kc3 85 Qg3+ Kc4 86 g7 Qf7+ 87 Kd6 Qf6+ 88 Kc7 Qf7+ 89 Kb6+-;
B) 76 ..d4 77 Qf7+ Ka1 78 g7 Qg3+ 79 Kc6 Qc3+ 80 Kd7 Qh3++-;
C) 76 ..Kb1 77 Qb8+ Kc2 78 Qc7+ Kd3 79 g7 Qf4+ 80 Kc6 Qc4+ 81 Kd7 Qg4+ 82 Ke8 Qg6+ 83 Kd8 d4 84 Qe5+-;
D) 76 ..Qf4+ 77 Qe5 D1) 77 ..Qf8+ 78 Kd7 d4 79 g7 Qf7+ 80 Kd6 d3 81 Qg5 Qg8 82 Qd2+ Ka1 83 Qe1+ Kb2 84 Qf2+ Kc3 (84 ..Kb1 85 Qf8+-) 85 Qf8+-; D2) 77 ..Qb4+ 78 Ke6 Qb6+ 79 Kf7 Qa7+ 80 Kg8 Qf2 81 g7 Kb3 82 Kh7 Qh4+ 83 Kg6 Qg4+ 84 Kf7 Qd7+ 85 Kf6 Qd8+ 86 Kg6 Qg8 87 Qg3+ Kc4 88 Qf4+ d4 89 Qf7+]

76 ..d4

[76 ..Kb1 77 Qf7 Qg4+ 78 Kc7 (78 Kd8 Qh4+ 79 Qe7 Qh8+ 80 Kc7 Qc3+; 78 Qe6) 78 ..Qg3+ (78 ..Qc4+ 79 Kb8+-) 79 Kb7+-]

77 Qf7+ Ka1

[77 ..Kb2 78 g7+-]

78 g7 Qb5+ 79 Kc7 Qc5+ 80 Kb7 Qb5+ 81 Ka8 Qc6+ 82 Qb7 Qe8+ 83 Ka7 Qg8 84 Qa6+ Kb2 85 Qb5+ Kc3 86 Qc5+ Kd3 87 Qf8 Qa2+ 88 Kb8 Qh2+ 89 Kc8 Qh3+ 90 Kd8 Qh4+ 91 Qe7+-