Author: Robert Hyatt
Date: 06:04:27 02/09/98
Go up one level in this thread
On February 09, 1998 at 04:33:34, Amir Ban wrote: > >This group is relatively easy and problem-free, so this will be short. >The hardest part is yet to come. > > >No. 504 (Nxf4): > >This may be the best move, but it doesn't achieve much more than >equality: 1.Nxf4 Nf3+ 2.Bxf3 Bxb2 3.Rb1 Bg7 and though Junior prefers >white, I think I would take black. > >Recommend: Drop it. > didn't get this in 20 secs... no data as of yet... > >No. 539 (Qh5): > >Not to argue with the key move, but 1... Nf2+ 2. Kh2 Rd3 3.Qc5 (Qb4) >Rxh3+ 0-1. > >Recommend: Add Nf2+ I get both. I get Nf2+, +5.79, after .5 seconds. I switch to Qh5, +6.03, at 2.8 seconds and stick there. They seem close... and too easy... > > >No. 551 (c4): > >It's correct. This is a pretty exercise in stalemating yourself. > >Recommend: No change. > > >No. 553 (Nxf7): > >I get Rxf7, which probably executes the key idea in the right order. The >problem with Nxf7 is Be6! for me, both are close. Nxf7 produces a score of +2.3, while Rxf7 produces a score of +2.36... crafty naturally prefers Rf7. However, I get it from ply=4 on (I don't print results for 1,2,3 iterations.) It's too easy... > >Recommend: Change key to Rxf7. > I wouldn't change, I would add, because Nxf7 Be6 is still lost for black. I didn't run it for an extended time to see if the two moves diverge in score later. > >No. 557 (Bxh4): > >I get Rf3. This looks like the most forceful move. The key is also ok. > >Recommend: Add Rf3. didn't find either move in 20 secs here... > > >No. 559 (Ng5): > >Again this one may be best but doesn't achieve much: 1.Ng5 Bxg5 2.Bxg5 >Be6! (but not Qd4+). White gets the c-pawn for all his trouble. > >Recommend: Drop it. I get Bf4, which is +1.48, at 2 seconds... I stick with this thru 20 seconds. > > >No. 560 (Nf3+): > >A position with dizzy complications. I find Ndc4 (+133). 1... Nf3+ >2.Rxf3 Nf5 3.Rxf5 gets about the same. I don't know what the intended >line is. > >Recommend: Investigate. > I get gxf5 early, +1.17, switch to Nf3 at 9 plies 18 seconds, +1.34... seem pretty close... > >No. 562 (Nxf7): > >The line is 1.Nxf7 Rxf7 2.Bxf6 Bxf6 3.Rxf6. It's okay to play Bxf6 >first. > >Recommend: Add Bxf6. I get Bxf6 at < 1 second, switch to Nf6 at 2.11 seconds, scores are close (+2.7 to +3.3) I then stick with Nxf7 reaching +5 after one minute... If I tell Crafty to only search Bxf6, I get +4.9... so they are close. And easy... > > >No. 566 (Rxc5): > >I have a cook for this: Ne5! This eliminates the d6 pawn, but from the >other side. > didn't get anything good within 20 secs here... >Recommend: Add Ne5. > > >No. 592 (Rxc5): > >I find Be3, and find that the pin on c5 does more (+351) than taking on >c5. ditto... +4 and climbing for me after 20 seconds... But I find Be3 instantly at +2 and never vayr... again, could be too easy... > >Recommend: Add Be3. > > >No. 597 (Bf4): > >I find Ba3 (+115). It's a bit fuzzy. I see that Bf4 only wins a pawn. >Ba3 wins an exchange, but maybe the knight will be trapped on a8. > >Recommend: Investigate. didn't find within 20 secs... > > >No. 600 (f5): > >I probably should try this with Hiarcs. I don't see a win after either >exf5 or Kg7. > >Recommend: Investigate. I've searched this thru depth=16, score=+.33... seems ambiguous at this depth at least... > > >Amir
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