Author: blass uri
Date: 03:13:57 10/05/99
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On October 05, 1999 at 01:14:03, Harald Faber wrote: >I remember I have heard that Junior has problems with "winning" pawns on a2/a7 >and h2/h7. I couldn't imagine. Now I have seen it with my own eyes: > >[Event "Chessnet"] >[Site "?"] >[Date "????.??.??"] >[Round "?"] >[White "King 2.55"] >[Black "Junior 5"] >[Result "*"] >[ECO "D49"] >[PlyCount "43"] > >1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 >a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Nxe5 12. Nxe5 axb5 13. Qf3 Bb4+ 14. Ke2 Rb8 >15. Nc6 Bb7 16. Bf4 Qd7 17. Bxb5 O-O 18. Bxb8 Rxb8 19. Rhc1 Bd6 20. Kf1 Bxc6 >21. Bxc6 Qa7 22. Rc2 * > >Now Junior5 takes the Ph2 and only is down with -1.00. After 23.g3 h5 (-1.32) >24.Kg2 Ng4 (-1.40) 25.Rd1 Rf8 (-1.55) > >Black has some problems getting the bishop back into the game... > >So Uri, what does your latest Junior version (5.9?) play, also take the pawn? Junior5.9 plays at 120/40(actually 120/19) on p200 Rc8 1.13/16 with the main line a4 Bxh2... but is smart enough to avoid Bxh2 after a4 happens in the game. It needs less than 1 minute to see that Bxh2 is bad after a4 and prefers another move(Junior5.0 can also avoid Bxh2 after a4 by search but cannot do it before a4) Junior5.9 did not like 22...Bxh2 from the first second. I could produce 22...Bxh2 with Junior5.9 only at 10 minutes/40 moves when it changed its mind at depth 13 to Bxh2 but at 20 minutes/40 moves it jumped from depth 12 to depth 14 and never considered Bxh2 as best. Junior5.9 is not perfect in avoiding Bxh2 moves but is clearly better in it relative to Junior5. After 22..Rc7 23.a4 Junior5.9 suggested at 120/40 Rc7 and the evaluation drpopped to 1.30 pawns for white. I used the watch command and Bxh2 is always in the first 14 best moves so Junior avoids Bxh2 by some positional knowledge The difference between Bxh2 and the best move is small(always less than 0.2 pawn and sometimes less than 0.1 pawn) Uri
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