... are games with random positions similar to FRC or Corner Chess.A very interesting wild variant is "Style 3" at USCL:
" In this variant the set of pieces is randomly chosen (subject to the constraint that there is one king of each color).It is quite possible to get more than the normal number of a given piece, such as three rooks or two queens. The pieces are
placed on the first rank behind the pawns, the position of Black's pieces mirrors White's placement, and castling is not allowed."

Three game examples played by me with a time of three minutes each player for the whole game:

[Event "GCS"]
[Site "GCS"]
[Date "2005.03.23"]
[White "Caissus"]
[Black "MrLudovit"]
[Result "1-0"]
[WhiteElo "1804"]
[BlackElo "1762"]
[TimeControl "180+0"]
[FEN "bbqnnqkq/pppppppp/8/8/8/8/PPPPPPPP/BBQNNQKQ"]


1. c4 e6 2. Nd3 a6 3. f4 Ba7+ 4. e3 Nc6 5. b3 Nd6
6. Nc3 Nf5 7. Qe2 h5 8. Kf1 h4 9. Nf2 b6 10. Bxf5 exf5
11. Nd3 d6 12. Nd5 Qfe8 13. Qg1 h3 14. Qgf2 Ne7 15. Qg3 hxg2+
16. Qgxg2 Nxd5 17. cxd5 c5 18. Qef2 b5 19. Qfg3 Qcd7 20. Qxg7+ Qxg7
21. Qxg7#
1-0

[Event "GCS"]
[Site "GCS"]
[Date "2005.03.23"]
[White "MrLudovit"]
[Black "Caissus"]
[Result "0-1"]
[WhiteElo "1755"]
[BlackElo "1865"]
[TimeControl "180+0"]
[FEN "rrbqnrnk/pppppppp/8/8/8/8/PPPPPPPP/RRBQNRNK"]


1. f4 f5 2. a4 Ngf6 3. a5 d6 4. Ngf3 c5 5. c3 Bd7
6. Qc2 Qc8 7. d4 cxd4 8. Nxd4 Nc7 9. Nef3 Nb5 10. e3 Nxd4
11. exd4 b5 12. axb6 axb6 13. Rxa8 Rxa8 14. Ng5 Bc6 15. Be3 Ne4
16. Qe2 Nxg5 17. fxg5 Be4 18. Rbe1 Qc6 19. Bf4 Ra2 20. Rf2 Rfa8
21. h4 Ra1 22. Rxa1 Rxa1+ 23. Kh2 Rb1 24. Qh5 Qb5 25. g4 Rxb2
26. Rd2 Rxd2+ 27. Bxd2 Qe2+ 28. Kg1 Qg2#
0-1

[Event "GCS"]
[Site "GCS"]
[Date "2005.03.23"]
[White "Caissus"]
[Black "MrLudovit"]
[Result "1-0"]
[WhiteElo "1906"]
[BlackElo "1749"]
[TimeControl "180+0"]
[FEN "brrkqqqb/pppppppp/8/8/8/8/PPPPPPPP/BRRKQQQB"]


1. b4 b6 2. g4 e6 3. Bxa8 Rxa8 4. f4 c5 5. bxc5 Qxc5
6. Qxc5 Rxc5 7. Qf3 Rac8 8. Bc3 g6 9. Bxh8 Qxh8 10. f5 gxf5
11. gxf5 Rxf5 12. Qb7 Qe5 13. Qxa7 Qe7 14. Qxb6+ Ke8 15. Rb3 Q7f6
16. Rg3 Rg5 17. Rxg5 Qfxg5 18. Qbf2 h5 19. Qef1 f5 20. Q2g2 Qxg2
21. Qxg2 Ke7 22. Qg5+ Kd6 23. Rb1 Qxh2 24. c3 Rc6 25. Qg7 Qh1+
26. Kc2 Qe4+ 27. Kd1 Qh1+ 28. Kc2 Qe4+ 29. Kc1 h4 30. Qf8+ Kc7
31. Qb8#
1-0