IntroductionFor several years, I have been fascinated by exotically shaped boards. In the early 2000s, I became interested in boards with triangular cells. At the time, trigonal tessellations had been little used; apart from Klinzha and a couple of applets by Christian Freeling, almost nothing existed in the world of trigonal chess. Since then, Graeme C. Neatham has put a lot of work into developing a number of variants, notably Delta88, which I consider to be the first successful trigonal game. The trigonal tiling pattern remains one of the least explored, however. This game reflects my own attempt to make a contribution. As the board is also round, it may be considered a hybrid between circular chess and trigonal chess.
The game takes its name from two sources, the rotor blades of the helicopter, in recognition of the circular shape of the board, and from Blades, another trigonal variant invented by Graeme Neatham. The triangular cells are blade-shaped.
RulesWin by checkmating the enemy King. A stalemate counts as a qualified win - better than a draw, but not as good as a checkmate. A checkmate is worth one point, a stalemate a half-point to the player forcing it, and a draw a half-point to both players.
In the variants in which Termites and Hornets replace Guards and Pawns, the King may be captured like other pieces when caught between two enemy Termites or Hornets. Capturing the King in this way is equal to a checkmate.