4 | | | | | | | | | |---------------------------------------| 3 | | | | | | | | | |---------------------------------------| 2 | | | ^B | | | | | | |---------------------------------------| 1 | | | | | | | | | --------------------------------------- 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 |
|---------------------------------------|
7 |    |    |    |    |    |    |    |    |
|---------------------------------------|
6 |    |    |    |    |    |    |    |    |
|---------------------------------------|
5 |    |    |    |    |    |    |    |    |
|---------------------------------------|
4 |    |    |    |    |    |    |    |    |
|---------------------------------------|
3 |    |    |    |    |    |    |    |    |
|---------------------------------------|
2 |    |    |    |    |    |    |    |    |
|---------------------------------------|
1 | #K |    |    |    |    |    |    | ^Kt|
---------------------------------------
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.

---------------------------------------
8 |    |    | #K |    |    |    |    |    |
|---------------------------------------|
7 |    |    |    |    |    | #P |    |    |
|---------------------------------------|
6 |    |    |    |    |    | ^Kt|    |    |
|---------------------------------------|
5 |    | ^K |    |    |    |    |    |    |
|---------------------------------------|
4 |    |    |    |    |    |    |    |    |
|---------------------------------------|
3 |    |    |    |    | ^Kt|    |    |    |
|---------------------------------------|
2 |    |    |    |    |    |    |    |    |
|---------------------------------------|
1 |    |    |    |    |    |    |    |    |
---------------------------------------
A    B    C    D    E    F    G    H

Diag. 44