Puzzle 68144:
Puzzle 68144:
Vassily Smyslov - Yuri Averbakh
28th URS-ch Moscow URS (17), 1961 Vassily Smyslov - Yuri Averbakh
28th URS-ch Moscow URS (17), 1961
28th URS-ch Moscow URS (17), 1961 Vassily Smyslov - Yuri Averbakh
28th URS-ch Moscow URS (17), 1961