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A lovely use of cannons and modern elephants, on a 10x10 board. I'd note that since defending each side's edge pawns can be an issue at times (as can be the development of either elephant), that alone seems to slightly inhibit the players from emulating many standard chess openings beyond a certain depth, but this is apparently very common for chess variants.

I'd tentatively estimate the piece values (on this game's 10x10 board) as follows: P=1; E=2.75; C=2.75(but 3.5 before endgame); N=3; B=3.5; R=5.5; Q=10; K's fighting value=2.5.

Here's 2 large CVs that also use cannons in the corners:

https://www.chessvariants.com/play/soho-chess

https://www.chessvariants.com/play/wide-soho-chess