31.5 ♜♞♝♛♚♝♞♜♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♜♞♝♛♚♝♞♜a8b7c6d5e4f3g2h1◀◀◀Start▶▶▶31.5 — Система Чигорина ♜♞♝♛♚♝♞♜♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♜♞♝♛♚♝♞♜a8b7c6d5e4f3g2h1◀◀◀Start▶▶▶Geller, Efim P — Hernandez, Roman Las Palmas · 1980.??.?? · 1-0 ♜♞♝♛♚♝♞♜♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♜♞♝♛♚♝♞♜a8b7c6d5e4f3g2h1◀◀◀Start▶▶▶Thomas, George Alan — Rubinstein, Akiba Baden-Baden · 1925.??.?? · 0-1 ♜♞♝♛♚♝♞♜♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♜♞♝♛♚♝♞♜a8b7c6d5e4f3g2h1◀◀◀Start▶▶▶Bogoljubow, Efim — Rubinstein, Akiba Baden-Baden · 1925.??.?? · 1/2-1/2 ♜♞♝♛♚♝♞♜♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♜♞♝♛♚♝♞♜a8b7c6d5e4f3g2h1◀◀◀Start▶▶▶Geller, Efim P — Smyslov, Vassily Palma de Mallorca Interzonal · 1970.12.01 · 1-0 ♜♞♝♛♚♝♞♜♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♜♞♝♛♚♝♞♜a8b7c6d5e4f3g2h1◀◀◀Start▶▶▶Geller, Efim P — Mecking, Henrique Palma de Mallorca Interzonal · 1970.11.11 · 1-0 ♜♞♝♛♚♝♞♜♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♟♜♞♝♛♚♝♞♜a8b7c6d5e4f3g2h1◀◀◀Start▶▶▶Reti, Richard — Lasker, Edward New York · 1924.??.?? · 1-0 ◀ Switching Off the Knight Restricting the Knight's Mobility ▶