WHITE.  BLACK.
       1.  R. to Q. B’s 2d. 1.  B. to Q. Kt’s 6th.
       2.  R. to B’s 8th. (ch.) 2.  B. to K. Kt’s sq.
       3.  K. to Q’s 6th. 3.  P. to Q. Kt’s 6th.
       4.  R. to Q. B’s 7th. 4.  B. to Q’s 4th. (best)
       5.  K. takes B. 5.  K. to Kt’s sq.
       6.  K. to his 6th. 6.  K. moves.
       7.  R. mates.

No. 21.

             BLACK.

+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | | | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
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+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| R*| | B | | | | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
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+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | | | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | K*| | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | | | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | | K | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+

                          WHITE.

No. 22.

             BLACK.

+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | | | B*| K*|
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | K | | | | P*|
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | | | | P |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | | | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | P*| | | | | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | | | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | P | | | R | | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | | | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+

                          WHITE.

No. 23.

             BLACK.

+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | | N*| | K*|
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| R | | | | | | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | | K | | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
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+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
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+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
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+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
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+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
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+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+

                          WHITE.

No. 24.

             BLACK.

+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| | | | | | K*| | |
+—–­+—–­+—–­+—–­+—–­+—–­+—–­+—–­+
| R | | | | | | | |