A bit of fun with Lozza online (how quick can you beat her)

[op12no2]

I've simplified the evaluation function to a single thing. Can you guess what that thing is by playing her. How quick can you win?

http://op12no2.me/toys/lozzamystery/play.htm

It was a bit of fun for some friends but you may or may not also find it fun.

[cdani]

Seems related to development.

[op12no2]

Seems related to development.

i guess that would be a side-effect yes, but there is a solitary simple evaluation metric.

[pilgrimdan]

I've simplified the evaluation function to a single thing. Can you guess what that thing is by playing her. How quick can you win?

http://op12no2.me/toys/lozzamystery/play.htm

It was a bit of fun for some friends but you may or may not also find it fun.

I played a sloppy game... but still managed to win...

1. e3 e5 2. c3 d5 3. d4 Bd7 4. Be2 Nc6 5. Nf3 e4 6. Ng1 Qf6 7. Bg4 Bxg4 8. Qxg4 Nh6 9. Qe2 Kd7 10. Nh3 Bd6 11. Nf4 g5 12. Nh5 Qe6 13. Nd2 a5 14. Nf1 a4 15. Nfg3 f5 16. Nf1 f4 17. exf4 Rhg8 18. fxg5 Nf5 19. Nf6+ Qxf6 20. gxf6 Ncxd4 21. cxd4 Nxd4 22. Qd2 c5 23. Ne3 Kc6 24. O-O a3 25. b3 Nf3+ 26. Kh1 Nxd2 27. Bxd2 Be5 28. Rab1 b6 29. Nf5 Bxf6 30. Rfc1 e3 31. Bxe3 Kd7 32. b4 Ke6 33. Ng3 Rg4 34. bxc5 b5 35. Rxb5 Bb2 36. Rc2 Rga4 37. c6 Rc8 38. c7 h5 39. Rb8 Kd7 40. Rxc8 Kxc8 41. Nf5 Ra8 42. Bd4 Bxd4 43. Nxd4 Kd7 44. g3 Rc8 45. Kg2 Rxc7 46. Rxc7+ Kxc7 47. Nb5+ Kc6 48. Nxa3 Kc5 49. Kf3 Kb4 50. Ke3 Kxa3 51. Kd4 Kb4 52. Kxd5 Kb5 53. f4 Kb6 54. f5 Kc7 55. Ke6 Kd8 56. Kf7 Kd7 57. f6 h4 58. g4 Kd6 59. Kg7 Ke5 60. f7 Kf4 61. f8=Q+ Ke4 62. a4 Kd5 63. a5 Kc4 64. a6 Kb5 65. a7 Kc4 66. a8=Q Kd3 67. Qfe8 Kd4 68. Qad8+ Kc3 69. Qc6+ Kb3 70. Qb8+ Ka2 71. Qa6#

[op12no2]

Here's another one:-

http://op12no2.me/toys/lozzamystery2/play.htm

Neither of them know anything about relative piece values - in each case eval is a single metric. This one goes for you

[op12no2]

I played a sloppy game... but still managed to win...

Thanks for trying it Dan.

[Ignacio]

I need 23 moves for win:
1. e4 d5 2. exd5 Qxd5 3. Nc3 Qe5+ 4. Be2 Nc6 5. Nf3 Bf5 6. Nxe5 Nxe5 7. d4 O-O-O 8. O-O Rd6 9. Bf4 Nh6 10. Bxe5 Rg6 11. Bd3 Bxd3 12. Qxd3 c6 13. d5 Rd6 14. Bxd6 exd6 15. dxc6 d5 16. Qxd5 Bd6 17. Qxd6 bxc6 18. Qxc6+ Kb8 19. Rad1 Rc8 20. Qb5+ Ka8 21. Rd7 Rb8 22. Qc6+ Rb7 23. Qxb7#

[op12no2]

I need 23 moves for win:

Thanks for trying it Ignacio.

In case anybody is interested the single metric for eval is difference in number of legal moves - which implicitly gives more mobile pieces more value and implicitly gives some development capability.

The 2nd one didn't work so well - ignore it - it was just based on attacks but would sac a queen to attack with a rook etc

[op12no2]

PS: the real Lozza is here:-

http://op12no2.me/toys/lozza/

It's written in Javascript and is interpreted and run in your browser in real time. As such if you do a long analysis it's your computer CPU that is used - there is no server involved.

Various UIs including a mate-in-1 trainer which is fun.