Puzzle 521183:
Puzzle 521183:
Yuri Averbakh - David Bronstein
28th URS-ch Moscow URS (4), 1961 Yuri Averbakh - David Bronstein
28th URS-ch Moscow URS (4), 1961
28th URS-ch Moscow URS (4), 1961 Yuri Averbakh - David Bronstein
28th URS-ch Moscow URS (4), 1961