Chess Strategy
possible to mate on a corner square commanded by the Bishop, as
the following argument shows clearly. A mating position in the
corner which the Bishop does not command would have to be of the
type set out in Diagram 42. Here the Bishop plays on White
squares, and the Knight in order to checkmate must move on to a
White square; in other words, he must come from a Black one.
Therefore, when the Bishop checked on the previous move and drove
the King away, the King had the option of two black squares, and
had no need to go into the corner one. He is only mated in
consequence of a wrong move.
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8 | | | | | | ^K | | #K |
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7 | | | | | | ^Kt| | |
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6 | | | | | | | | |
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5 | | | | | | | | |
|---------------------------------------|
4 | | | | | | | | |
|---------------------------------------|
3 | | | | | | | | |
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2 | | | ^B | | | | | |
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1 | | | | | | | | |
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A B C D E F G H
Diag. 42
As stated above, however, it is possible in all cases to mate
in the corner square which is of the same colour as the Bishop.
The King is driven into the corner in this way: the Knight cuts
him off such squares as the Bishop does not command. Diagram 43
will serve as an illustration.
1. K-Kt2, K-Kt2; 2. K-B3, K-B3; 3. K-Q4, K-K3; 4. Kt-Kt3, K-B3;
5. B-B3, K-Kt4; 6. K-K5, K-Kt3; 7. Kt-K4, K-Kt2; 8. K-B5, K-R1;
9. K-B6, K-Kt1; 10. Kt-Kt5, K-R1; 11. Kt-B7ch, K-Kt1; 12. B-K4,
K-B1; 13. B-R7, K-K1; 14. Kt-K5, K-Q1; 15. Kt-B4, K-B2; 16. B-K4,
K-Q2; 17. K-B7, K-B2; 18. K-K7, K-B1; 19. K-Q6, K-Q1; 20. B-Kt6,
K-B1; 21. Kt-R5, K-Q1; 22. Kt-Kt7ch, K-B1; 23. K-B6, K-Kt1; 24.
K-Kt6, K-B1; 25. B-B5ch, K-Kt1; 26. Kt-B5, K-R1; 27. B-K6, K-Kt1;
28. Kt-R6ch, K-R1; 29. B-Q5 mate.
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8 | ^B | | | | | | | #K |
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7 | | | | | | | | |
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6 | | | | | | | | |
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5 | | | | | | | | |
|---------------------------------------|
4 | | | | | | | | |
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3 | | | | | | | | |
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2 | | | | | | | | |
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1 | #K | | | | | | | ^Kt|
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A B C D E F G H
Diag. 43.
It is impossible to force a mate with the KING AND TWO KNIGHTS.
On the same grounds as given with respect to Diagram 42, the mate
can only be attained through the opponent making a bad move. But
a mate can be forced if the weaker side has a spare move which
prevents the stalemate, e.g. Diagram 44.
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8 | | | #K | | | | | |
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7 | | | | | | #P | | |
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6 | | | | | | ^Kt| | |
|---------------------------------------|
5 | | ^K | | | | | | |
|---------------------------------------|
4 | | | | | | | | |
|---------------------------------------|
3 | | | | | ^Kt| | | |
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2 | | | | | | | | |
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1 | | | | | | | | |
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A B C D E F G H
Diag. 44
1. Kt(K3)-Q5, K-Kt2; 2. K-B5, K-R3; 3. K-Kt4, K-Kt2; 4. K-Kt5, K-
R2; 5. Kt-B7, K-Kt2; 6. Kt(B7)-K8, K-R2; 7. Kt-Q6, K-Kt1; 8. K-
Kt6, K-R1; 9. Kt-Q7, P-B4; 10. Kt-Kt5, P-B5; 11. Kt-B7 mate.
Having decided as to the smallest amount of material advantage
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