Ten bishops

:)
What about ten queens?

Hm, why not mate? I think it will be more beautiful..

Oh sorry, it is already mate..In my opinion in bishop variations better may be mate construction without queens and rooks..

#2 Having ten queens isn't possible in standard chess, since you start the game with one queen and eight pawns for a maximum of nine queens.

However, crazyhouse is another story. 18 queens, 4 rooks, 4 bishops, 4 knights:
http://en.lichess.org/94assfU5/white#264