The Unknown Derek Oldbury

Problem Number 28: By Derek Oldbury

Black to move and win

An endgame study with subtle points

Solution To Problem Number 27: ... 15-10; 32-27 10-6; 27-23 6-1; 23-14 1-5 (easy so far); 12-16 11-8 (not so obvious); 16-19 8-3; 19-23 4-8; 23-26 8-11; 26-30 11-15; 30-26 (if 30-25, then 15-10 wins) 3-7; 26-17 7-10; 14-7 5-21. White wins.

Game Number 28. 'Double Corner' Opening

A fine trap by Basil Case, the American star. Set black men on squares 1 to 12; white men on squares 21 to 32.

Start moving: 9-14 23-19; 11-16 26-23; 5-9 22-17; 8-11 24-20; 1-5 25-22; 9-13 28-24; 3-8 30-26; 5-9 (into the trap: 14-18 is also a loss, and the reader should work out how to beat it) 32-28 (very surprising, and the only move which will force a win); 14-18 22-15; 11-18 23-5; 16-32 (if 16-30, then 20-16 wins for White) 5-1; 13-22 26-17; 7-11 17-14; 10-17 1-10; 17-22 Forms Diagram: White to move

Continue: ... 24-19 (essential); 11-15 21-17; 15-24 28-19; 32-28 19-15; 28-32 17-13; 32-28 13-9; 28-32 31-27; 32-23 15-11; 8-15 10-17. White wins.