Tiny Castling is a highly theoretical and important technique in Chess, as evidenced by its usage by the Late Great World Chess Champion Bobby Fischer in the 1991 Baby Cup hosted by Alfred Baby. Fischer was invited as a guest of honor the previous year, but couldn't attend as he was stuck working as an aluminum miner in the Czech Republic to make ends meet. The following year he showed up of his own volition to compete to make up for his absence. His first two games were considered a buildup for his grand finale.
In the first game, Fischer faced five year old Boris Spank. Spank castled queenside, causing Bobby to reply with castling kingside. Spank lost the game, leading many to believe that it it was his castling technique which cost him the victory. Following this, Fischer's next game was against three year old Bobby Fischer (no relation), and Fischer decided to one-up Fischer by castling kingside. Fischer was undeterred, and showed him the true power of chess genius by not castling Kingside nor Queenside, but rather, Tiny Castling. By moving his king one space over and his rook to e1, he managed to deliver an impressive checkmate to Fischer - the ever coveted O#.
But his final game was the most legendary of all. Fischer was primed and ready to face off against the Baby Cup's leading prodigy, the five month old Markus Munch. Munch saw the folly of his competitors and acted accordingly, and Tiny Castled at his earliest opportunity. Fischer stared at the child for a solid minute, knowing full well that he could squeeze his head like putty if he wanted to, but eventually he relented. Fischer retired to his relaxation area, closed all the curtains, and made a variety of anguished sounds ranging from spastic bursts of screaming to some kind of "Warmup Technique" that Fischer refused to elaborate on. All we know is that he spent five minutes doing it and it sounded like someone throwing wet sponges at a pane of glass.
When Fischer returned, he did the unthinkable. He didn't long castle, nor short castle, nor tiny castle. No, Fischer performed a zero-point castle, placing his rook and king on the same exact square, once again delivering checkmate in a stunning fashion. Markus Munch retired from chess permanently after that, and Fischer remains the only player in the world to have achieved the legendary status of O-O-O#, O-O#, O#, and the ever-elusive ' # ' Tiny Castling and Zero-Point castling were eventually banned, but Fischer continued to use the moves in his own private games. Some even believe that Zero-Point castling was the last chess move he ever made before Bobby Fischer died in prison.