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MIDDLE GAMES
145
white. black.
3. Kt.—K7(ch.) K—Rsq.
4. R×P(ch.) K×R
5. R—Rsq. (mate).

The error in Black's play was to take the adverse Queen, as it made an opening in the guard of his King that he could not repair. The open files were an advantage to White, but they were fatal to Black.


Example VII.—Position developed from a Petroff's (Russian) Defense.

White's forces should be arranged thus:—K on KKt.sq., Q on QKt.7, QKt. on QKt.sq., KKt, on KB3, QB on QBsq., KB on Q3 and Ps on KR2, KKt.2, KB2, Q4, QKt. 2 and QR2.

Black's forces should be arranged thus:—K on KKt.sq., Q on Qsq., Rs on QRsq. and KBsq., Kts. on K5 and Q2, Bs on Q3 and K3, and Ps on KR2, KKt.2, KB4, QB5, QB2 and QR2. (See diagram xxvii.)

White plays first, but Black wins. The game is notated thus:—