Iteration four

After playing a bunch of iteration three games, I decided that even a 10x8 board was too big. Then I had an epiphany - if I made Gargantua a game which could be played with existing chess boards and chess pieces, there would be no barrier to entry for any chess player anywhere in the world to try it out. That was the genesis of iteration four. With this iteration, it became possible to define Gargantua in a single sentence:

Gargantua is a chess variant where all the normal rules of chess apply, with the addition that the queen (now called a gargantua) has the ability to make legal knight moves as well as legal queen moves.

It would be silly for me to include a screenshot of the opening position of a Gargantua game, as it would be indistinguishable from the opening position of a normal chess game. However, it wouldn't be silly at all to include screenshots of positions in Gargantua games where a mate in one is possible, but wouldn't be possible in a normal chess game.

Puzzle of the day: how does Black mate in one here?

Note: the reason the board is purple is that in my Gargantua app I added the optional capability to change the color of the board to indicate various situations, and purple is the indicator for a mate in one. Blue is the indicator that a mate has occurred.

update: here's the solution