1. P-R6, PxP; 2. K-B3 dis. ch, K moves; 3. R-R2, or Kt2 ch, KxR; 4.
K-Kt2 and draw, as Black has to give up the rook, and the RP cannot be
queened, the Black bishop having no power on the White diagonal.
Extremely subtle.
_Position by B. Horwitz._
BLACK.
+---+---+---+---+---+---+---+---+
|WQ | | | | | | |BR |
+---+---+---+---+---+---+---+---+
| |WB | | | | |BQ | |
+---+---+---+---+---+---+---+---+
| | | | |WK | |BK |BP |
+---+---+---+---+---+---+---+---+
| | | | |WP | | | |
+---+---+---+---+---+---+---+---+
| | | | | |WP |BP |WP |
+---+---+---+---+---+---+---+---+
| | | | | | |WP | |
+---+---+---+---+---+---+---+---+
| |BB | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
WHITE.
The main idea being to checkmate with the bishop, this is accomplished
thus:--1. B-K4 ch, K-R4; 2. QxR, QxQ; 3. K-B7, Q-B sq ch; 4. KxQ, BXP;
5. K-B7, BxP; 6. B-Kt6 mate.
_Position by A. Troitzky._
BLACK.
+---+---+---+---+---+---+---+---+
| | | | |BR |BK |BB | |
+---+---+---+---+---+---+---+---+
| | | | |BKn|BP | |WP |
+---+---+---+---+---+---+---+---+
| | | |WP | |WKn| | |
+---+---+---+---+---+---+---+---+
| | | | | |WP | |WK |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
| | | | | |BR | | |
+---+---+---+---+---+---+---+---+
| | | | | | | | |
+---+---+---+---+---+---+---+---+
WHITE.