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Anti cheating "indicators"

#21
This looks great! Has the github project already been created?

I'm not a big fan of looking only at the loss of browser's focus or at the average time between moves to find cheaters (I like playing chess while doing other boring stuff) but I find this client side
analysis very interesting.
#22
" Some players start using the engine only at a later stage on the game (usually preceeded by a
large "setup" time at a stage where the position is not necessarily so complex or already desesperate against a human player). "
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I'd use caution speculating on solely one parameter. I took a 3 minute break during one of my recent games because I was at work and being interrupted LOL. The poor chap must've thought I was cheating
and left the game, even though my moves were still awful. Realise sometimes people have to use the loo, even in relatively short games!

I agree with all efforts on this site to chatch bots and cheaters. It's an awful epidemic on chess servers. The laughable thing is they think they've got to cheat even against beginners like me.

I'll take some of the advice I've seen and cancel game if I see 100-0-0 records or a name in the lists I've seen posted. Fortunately, I've nothing tangible to lose to cheaters except my pride.
#23
Please help with cheater!
[Event "Rated Game"]
[Site "http://en.lichess.org/analyse/9i6gdgph"]
[Date "2011.09.28"]
[White "JVirgilio"]
[Black "NinjaWithKatana"]
[WhiteElo "1373"]
[BlackElo "1605"]
[Result "1-0"]
[PlyCount "37"]
[Variant "Standard"]

1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bb5 a6 5. Bxc6 dxc6 6. Nxe5 Qe7 7. d4 Be6 8. Be3 O-O-O 9. Qf3 h6 10. O-O-O Nd7 11. Qg3 f6 12. Ng6 Qb4 13. Nxh8 Nb6 14. a3 Qc4 15. Bf4 Bd6 16. Bxd6 Rxd6 17. b3 Qxd4
18. Rxd4 Rxd4 19. Qxg7 1-0
#24
[Event "Rated Game"]
[Site "http://en.lichess.org/analyse/1lijzlav"]
[Date "2011.09.28"]
[White "NinjaWithKatana"]
[Black "JVirgilio"]
[WhiteElo "1632"]
[BlackElo "1346"]
[Result "0-1"]
[PlyCount "70"]
[Variant "Standard"]

1. e4 Nc6 2. d4 e6 3. Bb5 a6 4. Ba4 g6 5. Nf3 Nf6 6. Nc3 b5 7. Bb3 b4 8. Ne2 Nxe4 9. c3 d5 10. Ba4 Bd7 11. O-O Bg7 12. Re1 O-O 13. Bc2 Qe7 14. Nf4 f5 15. Bxe4 fxe4 16. Ne5 Nxe5 17. dxe5 bxc3 18. bxc3
Bxe5 19. Ne2 Bxh2+ 20. Kxh2 Qh4+ 21. Kg1 Qxf2+ 22. Kh1 Ba4 23. Qd2 e3 24. Qxe3 Qxe1+ 25. Kh2 Qh4+ 26. Kg1 e5 27. Bb2 Rab8 28. Qd2 Qf2+ 29. Kh2 Rf5 30. Qxd5+ Kg7 31. Ng3 Rg5 32. Qd3 Rxb2 33. Rg1 Bc6
34. c4 Qf4 35. Qc3 Qh4# 0-1
#25
[Event "Rated Game"]
[Site "http://en.lichess.org/analyse/zcwx47pb"]
[Date "2011.09.28"]
[White "JVirgilio"]
[Black "NinjaWithKatana"]
[WhiteElo "1318"]
[BlackElo "1660"]
[Result "1-0"]
[PlyCount "67"]
[Variant "Standard"]

1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Nxe5 d6 5. Qf3 dxe5 6. Qxe4 Qxd4 7. Qxd4 exd4 8. Bd3 Bd6 9. O-O O-O 10. Nd2 Nc6 11. Nc4 Be6 12. Nxd6 cxd6 13. b3 Rac8 14. Ba3 Rfd8 15. f4 Ne7 16. f5 Bd5 17. f6 Nc6
18. fxg7 Kxg7 19. Rf4 Be6 20. Bb2 Rg8 21. Re1 f6 22. Rxe6 Rgf8 23. Rg4+ Kf7 24. Rxd6 Ne5 25. Rf4 Nxd3 26. cxd3 Kg6 27. Bxd4 Rc1+ 28. Kf2 Rc2+ 29. Kf3 Rxa2 30. Rdxf6+ Rxf6 31. Rxf6+ Kg5 32. h4+ Kxh4
33. Rf5 Ra1 34. Bf6# 1-0
#26
JVirgilio

He plays sometimes like an intermediate player and some times he plays like a novice.

Look at his graph something is strange...
He stays at one rating then his graph goes up and down.

Im not sure what to say I will test one or two games and analyze them with my engine.
#28
agreed

looks like September 19th he started cheating; he won 15 games in a row. that's the date his rating spikes, and it's also when his style changes. Every game before that date as white he played the
Scotch against e5, Nc6; as black against e4 he played the Scandinavian exclusively. From 9/19 on he starts playing 3.Bc4 and 3.Bb5 as white and 1...e5 as black against e4.

worth noting as well is the time graph for the 4 games vs Ninja.

1st game (he lost):

2-3s. (12 moves)
4-5s. (15 moves)
6-7s. (6 moves)
8-9s. (5 moves)
10-11s. (2 moves)
12-13s. (2 moves)
16+s. (6 moves)

next 3 games (he won):

White - JVirgilio (1373) - time per move distribution
4-5s. (3 moves)
6-7s. (7 moves)
8-9s. (5 moves)
12-13s. (2 moves)
14-15s. (1 moves)

Black - JVirgilio (1346) - time per move distribution
2-3s. (1 moves)
4-5s. (5 moves)
6-7s. (15 moves)
8-9s. (10 moves)
10-11s. (3 moves)
16+s. (1 moves)

White - JVirgilio (1318) - time per move distribution
2-3s. (1 moves)
4-5s. (7 moves)
6-7s. (5 moves)
8-9s. (9 moves)
10-11s. (5 moves)
12-13s. (3 moves)
16+s. (3 moves)
12-13s. (3 moves)
16+s. (3 moves)

---

1st game 12 moves 2-3 seconds. next 3 games combined 2 moves 2-3 seconds
#29
He's less clear than others because he only uses a program ~ half the time, but it's clear enough.

Nobody goes from ~1000 rating consistently to 1500+ in less than a month without some outside assistance.

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