Author: Tim Foden
Date: 00:03:53 02/19/04
Go up one level in this thread
On February 18, 2004 at 10:15:28, Mihaly Szalai wrote:
>[D]1knB4/8/7p/5R2/7K/8/3r4/7B w - - 0 1
>
>White has a very nice play here:
>1. Rb5+ Nb6 2. Bxb6! Rh2+ 3. Kg4! Rxh1 4. Bg1+! Kc7 5. Rb1! Kd7 6. Re1 Kc6 7.
>Rd1
>Kb5 8. Rc1 Ka4 9. Rb1 +-
>
>I wonder how many engines can see this line and how fast.
The version of Green Light that I ended up with in Graz likes Rb5+ after 28
seconds.
15 27.640 +3.205 31454k Rb5+ Nb6 2. Bxb6 Rh2+ 3. Kg4 Rxh1 4. Bg1+ Kc8 5.
Rb1 Kd7 6. Re1 h5+ 7. Kg3 Kc6 8. Rd1 Kb5 9. Rc1
Ka4 10. Kf4
It gets it after 1 minute 20 seconds. It's not quite the same line as above as
it does h5+ earlier than required (this is a transposition though), but
otherwise looks good:
17 1:19.85 +4.657 91517k Rb5+ Nb6 2. Bxb6 Rh2+ 3. Kg4 Rxh1 4. Bg1+ Kc8 5.
Rb1 Kd7 6. Re1 h5+ 7. Kg3 Kc6 8. Rd1 Kb5 9. Rc1
Ka4 10. Rb1 h4+ 11. Kg2 Rxg1+ 12. Rxg1
I'll have to figure out what allows it to see this when my other versions of
Green Light that are in development do not :)
Cheers, Tim
Full analysis: GLC 3.0.3.5 (Graz), 48 MB hash, AXP 2.1GHz...
Game stage: Endgame
Current eval: 3.365
Ply Time Score Nodes Principal variation
5 0.010 +3.353 7027 Rb5+ Nb6 2. Rxb6+ Kc8 3. Kh5 Kxd8 4. Rb7
5 0.010 +3.353 11174 Rb5+ Nb6 2. Rxb6+ Kc8 3. Kh5 Kxd8 4. Rb7
6 0.020 +3.324 18138 Rb5+ Nb6 2. Rxb6+ Kc8 3. Bf6 Rh2+ 4. Kg3 Rxh1 5.
Kf4
6 0.020 +3.324 25968 Rb5+ Nb6 2. Rxb6+ Kc8 3. Bf6 Rh2+ 4. Kg3 Rxh1 5.
Kf4
Generating internal KP-K end-game table...
Done (0.151 secs)
7 0.201 +3.247 50250 Rb5+ Nb6 2. Be4 Rxd8 3. Rxb6+ Kc7 4. Rc6+ Kd7 5.
Kh5 Rg8
7 0.241 +3.271 83553 Bd5 Nd6 2. Re5 Rd4+ 3. Kh5 Nf7 4. Bxf7 Rxd8
7 0.251 +3.271 106399 Bd5 Nd6 2. Re5 Rd4+ 3. Kh5 Nf7 4. Bxf7 Rxd8
8 0.321 +3.191 178124 Bd5 Nd6 2. Re5 Nf7 3. Bxf7 Rxd8 4. Rb5+ Kc7 5. Kh5
8 0.371 +3.246 234143 Rb5+ Nb6 2. Kh5 Rh2+ 3. Bh4 Rxh1 4. Rxb6+ Kc7 5.
Re6 Rh3 6. Rg6
8 0.391 +3.246 275607 Rb5+ Nb6 2. Kh5 Rh2+ 3. Bh4 Rxh1 4. Rxb6+ Kc7 5.
Re6 Rh3 6. Rg6
9 0.501 +3.206 395740 Rb5+ Nb6 2. Kh5 Rh2+ 3. Bh4 Rxh1 4. Rxb6+ Kc7 5.
Rg6 Kd7 6. Rg7+ Kd6 7. Rf7
9 0.621 +3.206 561386 Rb5+ Nb6 2. Kh5 Rh2+ 3. Bh4 Rxh1 4. Rxb6+ Kc7 5.
Rg6 Kd7 6. Rg7+ Kd6 7. Rf7
10 0.852 +3.207 822079 Rb5+ Nb6 2. Kh5 Rh2+ 3. Bh4 Rxh1 4. Rxb6+ Kc7 5.
Rg6 Rd1 6. Bg3+ Kd7 7. Be5 Rh1+ 8. Kg4
10 1.613 +3.226 1681247 Bd5 Nd6 2. Re5 Nc4 3. Bxc4 Rd4+ 4. Kh5 Rxc4 5. Bf6
Kc7 6. Rd5
10 1.743 +3.226 1847028 Bd5 Nd6 2. Re5 Nc4 3. Bxc4 Rd4+ 4. Kh5 Rxc4 5. Bf6
Kc7 6. Rd5
11 1.993 +3.245 2110078 Bd5 Nd6 2. Re5 Nc4 3. Bxc4 Rd4+ 4. Kh5 Rxc4 5.
Rb5+ Kc8 6. Rd5 Kb7 7. Bf6
11 2.464 +3.245 2685329 Bd5 Nd6 2. Re5 Nc4 3. Bxc4 Rd4+ 4. Kh5 Rxc4 5.
Rb5+ Kc8 6. Rd5 Kb7 7. Bf6
12 3.005 +3.201 3289492 Bd5 Nd6 2. Re5 Nc4 3. Bxc4 Rxd8 4. Kh5 Rd2 5. Re7
Rh2+ 6. Kg6 Rg2+ 7. Kf5 h5
12 4.397 +3.201 5000549 Bd5 Nd6 2. Re5 Nc4 3. Bxc4 Rxd8 4. Kh5 Rd2 5. Re7
Rh2+ 6. Kg6 Rg2+ 7. Kf5 h5
13 5.568 +3.159 6307510 Bd5 Nd6 2. Re5 Nc4 3. Bxc4 Rd4+ 4. Kh5 Rxc4 5. Bf6
Kc7 6. Re3 Kc6 7. Be5 Kd5
13 9.103 +3.159 10366k Bd5 Nd6 2. Re5 Nc4 3. Bxc4 Rd4+ 4. Kh5 Rxc4 5. Bf6
Kc7 6. Re3 Kc6 7. Be5 Kd5
14 11.226 +3.150 12748k Bd5 Nd6 2. Re5 Nc4 3. Bxc4 Rd4+ 4. Kh5 Rxc4 5. Bf6
Kc7 6. Be7 Rc3 7. Rd5 Rh3+ 8. Bh4 Rc3
14 17.095 +3.150 19596k Bd5 Nd6 2. Re5 Nc4 3. Bxc4 Rd4+ 4. Kh5 Rxc4 5. Bf6
Kc7 6. Be7 Rc3 7. Rd5 Rh3+ 8. Bh4 Rc3
15 22.623 +3.172 25625k Bd5 Nd6 2. Re5 Nc4 3. Bxc4 Rd4+ 4. Kh5 Rxc4 5. Rd5
Kb7 6. Be7 Kc6 {ht}
15 27.640 +3.205 31454k Rb5+ Nb6 2. Bxb6 Rh2+ 3. Kg4 Rxh1 4. Bg1+ Kc8 5.
Rb1 Kd7 6. Re1 h5+ 7. Kg3 Kc6 8. Rd1 Kb5 9. Rc1
Ka4 10. Kf4
15 39.257 +3.205 44596k Rb5+ Nb6 2. Bxb6 Rh2+ 3. Kg4 Rxh1 4. Bg1+ Kc8 5.
Rb1 Kd7 6. Re1 h5+ 7. Kg3 Kc6 8. Rd1 Kb5 9. Rc1
Ka4 10. Kf4
16 58.464 +3.095 65525k Rb5+ Nb6 2. Bxb6 Rh2+ 3. Kg4 Rxh1 4. Bg1+ Kc8 5.
Rb1 Kd7 6. Re1 h5+ 7. Kg3 Kc6 8. Rd1 Kb5 9. Rc1
Ka4 10. Ra1+ Kb3 11. Kf4
16 1:13.70 +3.095 83263k Rb5+ Nb6 2. Bxb6 Rh2+ 3. Kg4 Rxh1 4. Bg1+ Kc8 5.
Rb1 Kd7 6. Re1 h5+ 7. Kg3 Kc6 8. Rd1 Kb5 9. Rc1
Ka4 10. Ra1+ Kb3 11. Kf4
17 1:14.25 +3.495 83873k Rb5+ {++} Nb6 2. Bxb6 Rh2+ 3. Kg4 Rxh1 4. Bg1+ Kc8
5. Rb1 Kd7 6. Re1 h5+ 7. Kg3 Kc6 8. Rd1 Kb5 9.
Rc1 Ka4 10. Rb1 h4+ 11. Kg2 Rxg1+ 12. Kxg1
17 1:19.85 +4.657 91517k Rb5+ Nb6 2. Bxb6 Rh2+ 3. Kg4 Rxh1 4. Bg1+ Kc8 5.
Rb1 Kd7 6. Re1 h5+ 7. Kg3 Kc6 8. Rd1 Kb5 9. Rc1
Ka4 10. Rb1 h4+ 11. Kg2 Rxg1+ 12. Rxg1
Analyse>exit
local: t=1:48.79 nps=1188554.4 n=129299264 (31.7% / 68.3%)
total: t=1:48.79 nps=1188554.4 n=129299264
stats: fh=90.5%/4.17%/1.504% draws=90275
trans: probes=40855550 hits=9633508 (23.58%) draft=6887351 (16.86%)
tcuts: exact=1643 (0.00%) upper=3930879 (9.62%) lower=1913654 (4.68%)
tstor: exact=1669 (0.01%) upper=8936329 (64.38%) lower=4941701 (35.60%)
ehash: probes=0 hits=0 (-1.$%)
ext: check=7014011 recap=212351 ppush=1466 1rep=98126 thrt=122287
q-moves: gen=21444869 tested=17643223 made/un=8942627 max-dep=5
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