Seasons

You have to take the other kings, and once you have then all their pieces become yours.

Oops! Sorry - that was another applet entirely (there are several variations out there.)
It's blue v. red team play, and you have to put both the red kings in mate to win. Once you mate one, his pieces can't move or be taken (they go black,) so you can go after the other - but be careful not to unmate him, or he's back in the game! (And obviously, the red team are trying to do the same to you!)
You'll probably find that easier to coordinate if you play both the blue players.

Hello Everyone

Hi, aradiea! What a pretty name!

fxe4

Rxd6

Hi, aradiea! What a pretty name!

Goddess of Retribution and Queen of the Witches, I believe.

Anyway, Hi Aradiea

Kg1

I can't get the pieces to move on BJ's new board.

Click "Okay" to confirm which players you're playing (I assume you've selected both blues, so it's been changed from the default?)

ps: I'd advise a flank opening unless you're happy for the carnage to take immediate effect - the bishops are automatically inter-fianchettoed once you move the pawns!

Kg1

Uh, the king's already on g1 by my reckoning - he hasn't moved since he castled at move 11

1. c4 e5
2. Nc3 Nf6
3. Nf3 d6
4. d4 xd4
5. Nxd4 Be7
6. g3 c5
7. Nc2 Bf5
8. Ne3 Be6
9. Bg2 Nc6
10. b3 Ng4
11. 0-0 Bf6
12. Bb2 Be5
13. Qc1 Qf6
14. Ne4 Qh6
15. Nxg4 Bxg4
16. Qxh6 gxh6
17. Rb1 0-0
18. e3 Bf5
19. Bxe5 dxe5
20. Rbd1 Bxe4
21. Bxe4 f5
22. Bf3 e4
23. Bh5 Rad8
24. Rd5 Rxd5
25. cxd5 Nb4
26. d6 Rd8
27. Rd1 Nd3
28. g4 f4
29. g5 hxg5
30. f3 fxe3
31. fxe4 Rxd6

Oh... So it looks like this, with Black in upper case?

......K.
PP.....P
...R....
..P...Pb
....p...
.p.NP...
p......p
...r..k.

?