Puzzle 220165:
Puzzle 220165:
Paul Keres - Tigran V Petrosian
Candidats Tournament Bled/Zagreb/Belgrade (4), 1959 Keres - Petrosian, Bled/Zagreb/Belgrade 1959
Candidats Tournament Bled/Zagreb/Belgrade (4), 1959 Keres - Petrosian, Bled/Zagreb/Belgrade 1959