18 Queens is Possible

With white to move, its mate in 4.

Qaxf7+ Qgxf7 (Only move), Qfxf7. Now here white has two options. Either 1) Kxf7 or 2) Qhxf7.

1) If Kxf7 then Qhxh7+, Ke8 or Kf8 only moves. Either way Qbh8 is mate.

2) If  Qhxf7 then Qbh8+. Now black has two options a) Qfg8 or b) Qff8.

a) If Qfg8, then Qgxg8 is #.

b) If Qff8, then Qgg6 is #.

I think you have too much time on your hands.....

20 Knights would be even easier because I wouldn't have to manuevre n them while deal with checks, pins..etc.

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 mate in 4 for wite

 Yeah, white can mate in 4

I think this one is very cool. I would like to see 12 knights and 12 bishops. Maybe I'll get to work on that

knights are even easier cause the queens tend to pin each other which is extremely annoying

18 bishops of the same color, 20 total

I'll try some time

Maybe I just missed the last moves... but if there are 2 pawns left there can't be 18 queens on board

There's no pawns left and each side has 9 queens=18.