Puzzle 23071:
Puzzle 23071:
GM P. Tregubov (2589) - GM A. Rychagov (2534)
71st Moscow Blitz Moscow RUS, 2017.09.03 Tregubov - Rychagov, Moscow 2017
71st Moscow Blitz Moscow RUS, 2017.09.03 Tregubov - Rychagov, Moscow 2017