Solid+contents
71Open file — a b c d e f g h …
72Black Knights' Tango — a b c d e f g …
73Check (chess) — a b c d e f g h …
74Chigorin Defense — a b c d e f g …
75Chaturaji — a b c d e f g h …
76Queen's Gambit Declined — a b c d e f g …
77Colle System — a b c d e f g h …
78Dunsany's chess — a b c d e f g h …
79Queen's Gambit Declined, Elephant Trap — a b c d e f g h …
80Modern Defense, Monkey's Bum — a b c d e f g h …