I was playing against a personality and the game ended up with me having a rook and a knight and my opponent having a rook. I tried in vain to figure out a way to checkmate. I set up a board position of this endgame with CM vs CM and it just made ridiculous moves, even though there is a KRNKR file in the EGDB. Is this endgame a draw? Or is it a win in over 50 moves? If the latter is the case, is there a setting where I can relax the 50-move rule?

Yes, I set up a KRNKR endgame with kings in normal position, white rook and knight in corners on back row, and black rook on black's back row but one file over from white's rook. CM then proceded to quickly make nonsensical moves for a little bit and then drew by repitition. Since CM moved so quickly, I think it knows it's a draw (at least within 50 moves); because when I set up 5 man endgames that CM doesn't know, it takes a while to think before making the first move, and also makes reasonable moves.

Here is the start of the endgame from my game:

8/8/8/5R2/5nk1/8/6r1/4K3 w - - 0 59

Here is the whole game if you want to see it:

[Event "Chessmaster 10th Edition Rated Game"]
[Site ""]
[Date "2007.7.8"]
[Round ""]
[White "Sunny"]
[Black "Astronominoff"]
[TimeControl "40/900"]
[Result "1/2-1/2"]
[ECO "oft "]

1.g3 d5 2.Bg2 e5 3.Nc3 Nf6 4.Nb5 a6 5.Nc3 Nc6 6.Nf3 Be6 7.Ng5 Bf5 8.e4 dxe4 9.h3 h6 10.Ngxe4 Bd6 11.Kf1 O-O 12.g4 Bg6 13.a4 Re8
14.g5 hxg5 15.h4 g4 16.h5 Bf5 17.h6 g6 18.Nxf6+ Qxf6 19.Nd5 Qe6 20.d3 Kh7 21.Bg5 Be7 22.Bxe7 Nxe7 23.Nxc7 Qb6 24.Nxa8 Rxa8
25.Ra3 Rd8 26.Rb3 Qd6 27.Rxb7 e4 28.Qd2 exd3 29.c4 Re8 30.Qc3 f6 31.Qd2 Be6 32.Kg1 Bxc4 33.b3 Bf7 34.Be4 g3 35.Kg2 gxf2 36.Qxd3
Qxd3 37.Bxd3 Bd5+ 38.Kxf2 Bxh1 39.Rd7 Kxh6 40.Bxa6 Nf5 41.Bb5 Re3 42.Rd8 Bf3 43.a5 Rxb3 44.a6 Be4 45.Be2 Rb2 46.Ke1 Ra2 47.Bc4
Rb2 48.Be2 Ne3 49.Bd3 Bf3 50.a7 Kg5 51.a8=Q Bxa8 52.Rxa8 f5 53.Ra6 Kh5 54.Rc6 Rg2 55.Re6 Nd5 56.Re5 Nf4 57.Bxf5 gxf5 58.Rxf5+
Kg4 59.Rb5 Ra2 60.Kd1 Ng2 61.Kc1 Kf3 62.Kb1 Rf2 63.Rb2 Rf1+ 64.Ka2 Ne3 65.Rb1 Nd1 66.Rb8 Ke2 67.Rh8 Rf3 68.Rh2+ Nf2 69.Rh5 Kd2
70.Rd5+ Kc3 71.Rc5+ Kb4 72.Rc8 Nd3 73.Rb8+ Kc3 74.Rc8+ Kb4 75.Rb8+ Kc4 76.Rc8+ Nc5 77.Kb2 Rf2+ 78.Ka3 Kb5 79.Rg8 Ne4 80.Kb3 Rf3+
81.Ka2 Nc3+ 82.Kb3 Nd5+ 83.Kb2 Kb4 84.Rb8+ Kc4 85.Ra8 Rf2+ 86.Ka3 Nc3 87.Rc8+ Kd3 88.Rd8+ Kc2 89.Kb4 Rf7 90.Kc5 Rf4 91.Rh8 Kd2
92.Rd8+ Ke3 93.Re8+ Ne4+ 94.Kd5 Rf5+ 95.Kc6 Rc5+ 96.Kb6 Kd4 97.Rxe4+ Kxe4 98.Kxc5 1/2-1/2