EP1 - Open File EP2 - Fool's Mate EP3 - Light Square EP4 - Dubious Move EP5 - Touch and Move EP6 - Over Step EP7 - Weak Square EP8 - Distraction EP9 - Connected Passed Pawn EP10 - Illegal Move EP11 - Backward Pawn EP12 - Block EP13 - Bad Move EP14 - Smothered Mate EP15 - Triangulation EP16 - Automaton EP17 - Dynamic Possibilities EP18 - Transposition EP19 - Queening Square EP20 - Triple Rook EP21 - Grand Master