Theme
idea of a chess problem
castling
echo
pure mate
retrograde analysis
stalemate
Zugzwang
bypassing
clearance sacrifice
deflection
Novotny
joke chess problem
grotesque
ideal mate
domination
model mate
capture in chess
aristocratic problem
blocking
Pauly
Decoy
economical mate
albino
keeping-busy manoeuvre
mirror mate
fork
Turton doubling
Babson task
battery
Berlin theme
pin
check
Grimshaw