IMHO the best among popular chess variants are in this order: 1.) Standard Chess 2.) Chess960 3.) King of the Hill 4.) Capablanca Random Chess (just amazing) 5.) Gothic Chess 6.) Crazyhouse 7.) McCooey's Hexagonal Chess 8.) Shafran's Hexagonal Chess. Yes, we can have a lot of fun playing chess variants. However, some FMs and GMs believe that playing some of these variant could be actually, harmful for our Standard Chess skills. I am going to ask them publicly about their opinion on this topic.
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i posted here a while back but while i'm at it i would like to mention that in automate stockfish hangs a lot of pieces. I also started playing bughouse more so bughouse takes the cake for favorite for me