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(1) Bifurcators > (2) Great Shatranj > Mastodon > Three Player > (5) Unicorn Great > Big Board > Sissa > Eurasian > Schoolbook > (10) Fischer Random > Bilateral > Centennial > Kings Court > Wildebeest > (15) Transactional > (16) Fantasy Grand > Black Ghost > Eight-Stone > Modern > (20) Melee > Templar > Courier de la Dama > Switching > (24) Seirawan. Deserving Next Chess consideration, interesting Transactional Chess http://www.chessvariants.org/incinf.dir/transactional.html is essentially a variant of Kriegspiel, with multi-move feature and more option to rollback and not commit. Basically that core is great since in 1900 Kriegspiel was the most popular CV. Under ''Structure of a Turn'' it says, ''If the move did not succeed, the player chooses another move.'' That provision is cumbersome since usually the transaction is all 5 moves before the endgame, not 4,3,2,or 1. Through the referee on third board is determined whether the block of 5 is legal, based on opponent's pending set of moves and squares therefore ''locked.'' There would be too much preoccupation with interpretation of rules instead of freedom to choose best moves, changing but somewhat worsening Kriegspiel. In overcomplexity there is correspondence to Fantasy Grand, a stand-in for Chess Different Armies, alongside which Transactional is now slotted.