Atlanta bug question

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Four.nine
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Atlanta bug question

Post by Four.nine »

Has anyone seen this bug with the Atlanta?


1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 Be7 6.Nf3 O-O 7.Rc1 c6 8.Bd3 dxc4 9..Bxc4 Nd5 10.Bxe7 Qxe7 11.Ne4 e5 12.dxe5 Nxe5 13.Nxe5 Qxe5 14.Nc3 Be6 15.Qb3 Qf4 ?????1-0

Atlanta Black
Atlanta is on Lev B2 1 min/move
Tournament book (option H2)

Opponent was Star Diamond, which was in book until move 14 and took about 3 minutes each for moves 14 and 15.

I repeated several times and couldn't believe 15. .. Qf4. Did resets, still the same.
The correct move is D5 F4, but the display and board squares were 100% E5 F4

Thanks for the help...let me know if I left out info.
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Steve B
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Re: Atlanta bug question

Post by Steve B »

Four.nine wrote:Has anyone seen this bug with the Atlanta?


1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 Be7 6.Nf3 O-O 7.Rc1 c6 8.Bd3 dxc4 9..Bxc4 Nd5 10.Bxe7 Qxe7 11.Ne4 e5 12.dxe5 Nxe5 13.Nxe5 Qxe5 14.Nc3 Be6 15.Qb3 Qf4 ?????1-0

Atlanta Black
Atlanta is on Lev B2 1 min/move
Tournament book (option H2)

Opponent was Star Diamond, which was in book until move 14 and took about 3 minutes each for moves 14 and 15.

I repeated several times and couldn't believe 15. .. Qf4. Did resets, still the same.
The correct move is D5 F4, but the display and board squares were 100% E5 F4

Thanks for the help...let me know if I left out info.
just tried the position at move 15 with my Atlanta
I can confirm the bug..Atlanta will play 15.Qf4?? from its book
it is a bug in the opening book
if you turn off all books at move 15 Atlanta will play 15.. Nf4
i think someone simply typed in the wrong book move when programming the computer

Bugged Book Regards
Steve
Four.nine
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Post by Four.nine »

Thank you for the confirmation.
"Typed in wrong":
That's most likely exactly what happened.
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Re: Atlanta bug question

Post by Larry »

Steve B wrote:

just tried the position at move 15 with my Atlanta
I can confirm the bug..Atlanta will play 15.Qf4?? from its book
it is a bug in the opening book
Out of curiosity I checked the Atlanta's poor cousin, the Mephisto Master,
to see if it too has the same bug. Seems the Master has a different
tournament book to the Atlanta. In tournament book mode (option h2)
the Master seems to run out of book at black's move 11. but does still
play the same move, ie, 11...e5 after a search. It agrees with the Atlanta for a couple
of moves, at least on the 5sec level, then goes off with other moves.
The Master is fully 7 years younger than the Atlanta. Maybe they saw
the bug themselves, and got around the problem by simply truncating
the book line.
L
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Post by Larry »

Four.nine wrote:Thank you for the confirmation.
"Typed in wrong":
That's most likely exactly what happened.
Yep, just checked with the Atlanta...typed in wrong is right!
As a piece of trivia, the Berlin Pro London also has a wrongly typed move
in a Ruy Lopez line. It was many years ago so I can't quite remember
which exact move. Too late to fire the office boy responsible...by now
he's a middle aged man.
L
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Post by Reinfeld »

Amazing! Now I have to go run the same test as others.

Side note: An interesting contest for human players becomes possible here. After Atlanta loses the Queen, play the game through and see how long it takes to deliver checkmate.

- R.
"You have, let us say, a promising politician, a rising artist that you wish to destroy. Dagger or bomb are archaic and unreliable - but teach him, inoculate him with chess."
– H.G. Wells
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Post by Four.nine »

One other Atlanta quirk:

I have seen Atlanta suddenly go into "STOP" mode, when pressing E1 to castle.
Don't have a move sequence saved, but this has happened maybe 3-4 times in about 100 games.
Next time it happens I will post move sequence. (I freaked because I thought the machine totally reset and the game was lost...but pressing the "GO" button just brings Atlanta back to life and continues the game).

Has this been documented previously?

And to respond to the "Queen's odds" comment:
That's about what I need!
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Post by Four.nine »

Larry wrote:
Four.nine wrote:Thank you for the confirmation.
"Typed in wrong":
That's most likely exactly what happened.
Yep, just checked with the Atlanta...typed in wrong is right!
As a piece of trivia, the Berlin Pro London also has a wrongly typed move
in a Ruy Lopez line. It was many years ago so I can't quite remember
which exact move. Too late to fire the office boy responsible...by now
he's a middle aged man.
L
Hello Larry,
Your Berlin Pro London is thus a "sullied" machine; the Ruy Lopez, no less. It really doesn't belong in any serious chess computer collectors stable...such as yours. My modest proposal is to get rid of it ASAP.
I will do you a great favor and magnanimously take it off your hands. Please ship it to me directly and relieve yourself of the shame.
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Re: Atlanta bug question

Post by Four.nine »

Steve B wrote:
Four.nine wrote:Has anyone seen this bug with the Atlanta?


1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 Be7 6.Nf3 O-O 7.Rc1 c6 8.Bd3 dxc4 9..Bxc4 Nd5 10.Bxe7 Qxe7 11.Ne4 e5 12.dxe5 Nxe5 13.Nxe5 Qxe5 14.Nc3 Be6 15.Qb3 Qf4 ?????1-0

Atlanta Black
Atlanta is on Lev B2 1 min/move
Tournament book (option H2)

Opponent was Star Diamond, which was in book until move 14 and took about 3 minutes each for moves 14 and 15.

I repeated several times and couldn't believe 15. .. Qf4. Did resets, still the same.
The correct move is D5 F4, but the display and board squares were 100% E5 F4

Thanks for the help...let me know if I left out info.
just tried the position at move 15 with my Atlanta
I can confirm the bug..Atlanta will play 15.Qf4?? from its book
it is a bug in the opening book
if you turn off all books at move 15 Atlanta will play 15.. Nf4
i think someone simply typed in the wrong book move when programming the computer

Bugged Book Regards
Steve
Observations:

1. This game was part of a tournament I was running. I decided on a do-over, because the Atlanta algorithm should not be punished for a technician's improper book entry.
The result was astounding:

[Event "Fall2017"]
[Black "Atlanta"]
[Date "Nov 11, 2017"]
[Result "0-1"]
[Round "38 do over"]
[White "SD"]

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 Be7 6.Nf3 O-O 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.Ne4 e5 12.dxe5 Nxe5 13.Nxe5 Qxe5 14.Nc3 Be6 15.Qb3 Nf4 16.Ne2 Nxg2+ 17.Kf1 Bh3 18.e4 Nf4+ 19.Ke1 Qxe4 20.f3 Qe7 21.Rd1 Rad8 22.Rg1 Nxe2 23.Bxe2 Rfe8 SD Resigns 0-1

This was, I believe, the fastest SD resignation... I have ever witnessed. It's almost as if the Atlanta was specially programmed for this specific opening line to quickly annihilate the SD (the curious student may wish to investigate this hypothesis further). If so, that would be "poetic justice": to be pre-programmed for a slam dunk win and an entry typo ends up making it a slam dunk loss!

2. Kudos to Steve B for the "turn off books" suggestion. Initially, I tried to just turn off tournament book...but the Atlanta just went right on with 15. .. Qf4.
Then, I rechecked the post, found it was "turn off ALL books" (square D2, as I recall) and that did it. Atlanta "thinks" for a while and pops out 15. .. Nf4.
SD move 16. Ne2?????? Is GAME OVER....not way later at move 24.


BTW, the 1 min/mv tournament finished as follows:

Tasc rev2.2 12-4
MCG Pro. 9.5-6.5
SD. 7.5-8.5
Mach4-50 Mhz. 6.5-9.5
Atlanta. 4.5-11.5
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Dave C
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Re: Atlanta bug question

Post by Dave C »

Four.nine wrote:BTW, the 1 min/mv tournament finished as follows:

Tasc rev2.2 12-4
MCG Pro. 9.5-6.5
SD. 7.5-8.5
Mach4-50 Mhz. 6.5-9.5
Atlanta. 4.5-11.5
Hi 49,

Do you have a breakdown of this tournament available? It would be interesting to see the wins. losses and draws. I am surprised the Mach4-50 didn't have a better result.

Curious...regards,
Dave
Four.nine
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Re: Atlanta bug question

Post by Four.nine »

Dave C wrote:
Four.nine wrote:BTW, the 1 min/mv tournament finished as follows:

Tasc rev2.2 12-4
MCG Pro. 9.5-6.5
SD. 7.5-8.5
Mach4-50 Mhz. 6.5-9.5
Atlanta. 4.5-11.5
Hi 49,

Do you have a breakdown of this tournament available? It would be interesting to see the wins. losses and draws. I am surprised the Mach4-50 didn't have a better result.

Curious...regards,
Dave

Hi Dave,

I'm trying to get it to you, but can't figure it out.

1. The table is a mess when cut and paste from Word.
2. I converted to pdf...but it can't be cut and paste
3. I tried saving as xml...and that was a total mess.

So let me in on the secret: how do you take a Word table and transfer to this
Forum...and still look like a table?
Four.nine
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Re: Atlanta bug question

Post by Four.nine »

Dave C wrote:
Four.nine wrote:BTW, the 1 min/mv tournament finished as follows:

Tasc rev2.2 12-4
MCG Pro. 9.5-6.5
SD. 7.5-8.5
Mach4-50 Mhz. 6.5-9.5
Atlanta. 4.5-11.5
Hi 49,

Do you have a breakdown of this tournament available? It would be interesting to see the wins. losses and draws. I am surprised the Mach4-50 didn't have a better result.

Curious...regards,
Dave
Hi Dave,

best I can do...done on desktop, not iPad. Almost readabl:

Fall 2017 Mini Tournament

Decided to play a mini tournament, TASC, Atlanta and MachIV, just to exercise the keypads and electronics (10/17: ADDED Millennium ChessGenius PRO)...and SD

A1 A2 Tasc1 Tasc2 M4 1 M4 2 SD1 SD2 CGP1 CGP2 Result Total

AW x x L65 L47 L59 L68 D64 WR82 D65 D60 2.5-5.5 4.5-11.5
AB x x D70 D87 L88 L86 WR23* L63 L88 L59 2-6
TW D70 D87 x x W53 W64 R61 W42 R59 W48 5-3 12-4
TB W65 W47 x x W63 W63 W33 W56 W71 R42 7-1
M4W W88 W86 L63 L63 x x L90 L83 W64 D56 3.5-4.5 6.5-9.5
M4B W59 W68 L53 L64 x x L78 WR72 L49 R57 3-5
SD R23 W63 R33 R56 W78 R72 x x R63 R53 2-6 7.5-8.5
SD D64 R82 W61 R42 W90 W83 x x W80 W67 5.5-2.5
CGPW W88 W59 W42! L71 W49 W57 L80 L67 x x 5-3 9.5-6.5
CGPB D65 D60 R48 W59 L64 D56 W63 W53 x x 4.5-3.5

* Atlanta has a bug in the D67 QGD Originally L15*

Computer Elo OPP elo Score calculator Performance vs. Predicted

TASC 2365 2241 12-4 +191 2432 10.5-5.5
MCG Pro 2307 2255 9.5-6.5 +66 2321 9-7
Atlanta 2270 2265 4.5-11.5 -163 2102 8-8
M4-50 2200 2282 6.5-9.5 -66 2216 ~ 6.5-9.5
Novag SD 2186 2286 7.5-8.5 -22 2264!! 6-10
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Results

Post by Dave C »

Hi 49,

Thank you for the results. Unfortunately, I do not know how to paste from Word to the forum either. There are some here that will be able to provide guidance. 8)

Still learning...regards,
Dave
Four.nine
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Re: Atlanta bug question

Post by Four.nine »

Dave C wrote:
Four.nine wrote:BTW, the 1 min/mv tournament finished as follows:

Tasc rev2.2 12-4
MCG Pro. 9.5-6.5
SD. 7.5-8.5
Mach4-50 Mhz. 6.5-9.5
Atlanta. 4.5-11.5
Hi 49,

Do you have a breakdown of this tournament available? It would be interesting to see the wins. losses and draws. I am surprised the Mach4-50 didn't have a better result.

Curious...regards,
Dave
The entire tournament was surprising, in that: you never knew what you were going to get. Ever single one of these computers calculated one (TASC) or in all other cases: SEVERAL complete dogs (my apologies to dogs). You state that "M4-50 didn't have a better result".
Yet, M4-50 beat Atlanta 4-0!!!!!!!
Here are the 4 games:


Game 33 M4 gets a win, that’s the good news (for M4). The bad is how dreadful the finish was. After Atlanta 31. Re7?? the eval was -17, but M4 missed about 5 knockout moves. In fairness, the position was 1 GHz StockFish territory, not Mach4-50 MHz.

[Event "Fall2017"]
[Black "M4-50"]
[Date "Nov 2, 2017"]
[Result "0-1"]
[Round "33"]
[White "Atlanta"]

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nbd7 8.d5 Nc5 9.Qc2 a5 10.a3 a4 11.Be3 Nb3 12.Rad1 Bd7 13.Nd2 Nd4 14.Bxd4 exd4 15.Nb5 Bxb5 16.cxb5 Re8 17.b6 Rc8 18.bxc7 Rxc7 19.Qb1 Qd7 20.Bd3 Rc5 21.f4 Ng4 22.Rde1 Ne3 23.Rf2 Rec8 24.Nf1 f5 25.exf5 Nxf5 26.Rfe2 Qf7 27.Bc2 b5 28.b4 Rc3 29.Bxf5 gxf5 30.Qa2 d3 31.Re7 Qf8 32.Kh1 Rb3 33.Qf2 Rxa3 34.Qa7 Rac3 35.Qe3 Kh8 36.Ng3 Rb3 37.Nh5 Bc3 38.Qe6 d2 39.Rf1 Bd4 40.Nf6 Bxf6 41.Rf7 Qd8 42.Qxf5 Bg7 43.Qg4 Bd4 44.Qf5 Qg8 45.Rxh7+ Qxh7 46.Qxc8+ Qg8 47.Qf5 Re3 48.Qh5+ Qh7 49.Qd1 Qd3 50.Qh5+ Kg8 51.Qg5+ Kf8 52.Rg1 d1=Q 53.Qd8+ Kg7 54.Qd7+ Kh6 55.Qxd6+ Kh5 56.g4+ Qxg4 57.Qh6+ Kxh6 58.Rxg4 Qe4+ 59.Kg1 Re1# 0-1

Game 34 Moron 4-50 parlays a +3.2 eval lead at move 37 into a draw by move 52, with such stellar calculations as 39. Kh2-h1?? and 50. Bf3? NOW, Atlanta, with a clear draw, calculates the loser 57. .. NxP?????? POINTLESSLY sacrificing Knight for 3 Pawns and quickly gets killed (eval +7 TEN moves later!). Atlanta has yet to win a game: 4D 6L!

[Event "Fall2017"]
[Black "Atlanta"]
[Date "Nov 2, 2017"]
[Result "1-0"]
[Round "34"]
[White "M4-50"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d6 9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2 Nc6 13.dxc5 dxc5 14.Nf1 Be6 15.Ne3 Rad8 16.Qe2 c4 17.Nf5 Rfe8 18.N3h4 a5 19.Bg5 h6 20.Nxe7+ Qxe7 21.Be3 Ng4 22.Nf5 Bxf5 23.Bb6 Rb8 24.exf5 Qh4 25.Bc5 Nf6 26.Rad1 Rbd8 27.Bd6 Rd7 28.Qe3 Red8 29.Qc5 Ne8 30.Qxc6 Nxd6 31.Rxe5 Qf6 32.Rde1 a4 33.f4 Qh4 34.Qf3 Ra7 35.Qe3 Rb7 36.Kh2 Qf6 37.Qd4 Rbd7 38.g3 Rb7 39.Kh1 Rbd7 40.Kg2 Rf8 41.Qd5 Rdd8 42.Qc6 Rc8 43.Qd7 Rfd8 44.Qe7 Ne8 45.Qxf6 Nxf6 46.Kf2 a3 47.Rxb5 axb2 48.Rxb2 Nd5 49.Be4 Nxc3 50.Bf3 Kf8 51.a3 Na4 52.Rc2 Nc5 53.Re3 Rd4 54.Rce2 g6 55.fxg6 fxg6 56.h4 Nd3+ 57.Kf1 Nxf4 58.gxf4 Rxf4 59.Rg2 c3 60.Rc2 Rxh4 61.Rexc3 Rxc3 62.Rxc3 Rh2 63.Rc6 Kf7 64.a4 g5 65.a5 Kf8 66.a6 Ra2 67.Rxh6 Kg7 68.Re6 Kf8 69.Be2 Kf7 70.Bc4 Ra4 71.a7 Rxc4 72.Ra6 Rc8 73.a8=Q Rxa8 74.Rxa8 Kg6 75.Kf2 Kf5 76.Ke3 Kg4 77.Ke4 Kg3 78.Rg8 Kg4 79.Rg6 Kh4 80.Kf3 Kh5 81.Rg8 Kh6 82.Kg4 Kh7 83.Rxg5 Kh6 84.Kf5 Kh7 85.Kf6 Kh6 86.Rd5 Kh7 87.Rd8 Kh6 88.Rh8# 1-0

Game 35 Atlanta is getting killed! This was a see saw game, a draw, until Atlanta completely screwed up stopping a passed “a” pawn w/ R+N (vs. R+B). Should have been easy, but 39. Kf2?, then 41. Nc5?? followed by 42. Nb3??? GAME OVER!

[Event "Fall2017"]
[Black "M4-50"]
[Date "Nov 3, 2017"]
[Result "0-1"]
[Round "35"]
[White "Atlanta"]

1.e4 c5 2.Nf3 d6 3.Bb5+ Bd7 4.Bxd7+ Qxd7 5.O-O Nf6 6.Re1 e5 7.d3 Be7 8.a3 O-O 9.b4 Nc6 10.bxc5 dxc5 11.Bb2 Qe6 12.Nc3 Rad8 13.Ng5 Qd7 14.Rb1 Qc8 15.a4 c4 16.Nf3 Bb4 17.Re2 Rfe8 18.Nb5 a6 19.Ba1 Bc5 20.Nc3 b6 21.Rd2 cxd3 22.cxd3 Re7 23.Rc1 Red7 24.a5 Ba3 25.Rcc2 Qb7 26.axb6 Qxb6 27.Na4 Qb5 28.Rxc6 Qxc6 29..Nxe5 Qe6 30.Nxd7 Rxd7 31.Bxf6 Qxf6 32.d4 Bb4 33.Rd3 Rc7 34.g3 Qe6 35.f3 Qa2 36.Nc5 h6 37.Qb3 Qxb3 38.Nxb3 a5 39.Kf2 Rc2+ 40.Ke3 a4 41.Nc5 a3 42.Nb3 a2 43.d5 Rb2 44.Na1 Rb1 45.Nc2 Rc1 46.d6 Rxc2 47.d7 a1=Q 48.d8=Q+ Kh7 49.Kf4 Qc1+ 50.Kg4 h5+ 51.Kxh5 Qh6+ 52.Kg4 Qe6+ 53.Kf4 Be7 54.Qd5 g5+ 55.Ke3 Bc5+ 56.Rd4 Qxd5 57.exd5 Rc4 58.f4 gxf4+ 59.Kxf4 Rxd4+ 60.Ke3 Rxd5+ 61.Ke4 Rd4+ 62..Kf5 Kg7 63.Kg5 f6+ 64.Kh5 Re4 65.h3 Bd6 66.h4 Rd4 67.g4 Bg3 68.g5 Rxh4# 0-1
Atlanta is 2-9. Poor! And M4-50 has moved up to 4.5-6.5 and will likely finish 3rd!

Game 36 The endgame played by these two imbeciles now enters the “Top Ten Tabletop Turds” of all time. No: Because both these machines are above 2200 Elo (!!!), it is the WORST ENDGAME ATROCITY....EVER. AT move 51, M4-50 has Mate in 12 and defecates 51. h3?????????????? (ostensibly, to save the “h” pawn) AND DRAWS!!!!!!!!! And then, ATLANTA, with an absolutely, positively, 100% draw calculates 57. .. a5??????????? GAME OVER. Mind-boggling; 2200+ Elo chess computers. M4-50 crushes Atlanta in the head to head 4-0. An atrocious Atlanta “achievement”. M4-50 has a good chance to finish .500: now 5.5-6.5.

[Event "Fall2017"]
[Black "Atlanta"]
[Date "Nov 4, 2017"]
[Result "1-0"]
[Round "36"]
[White "M4-50"]
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Post by Four.nine »

Game 36 got cut off:

Here we go


Game 36 The endgame played by these two imbeciles now enters the “Top Ten Tabletop Turds” of all time. No. Because both these machines are above 2200 Elo (!!!), it is the WORST ENDGAME ATROCITY....EVER. AT move 51, M4-50 has Mate in 12 and defecates 51. h3?????????????? (ostensibly, to save the “h” pawn) AND DRAWS!!!!!!!!! And then, ATLANTA, with an absolutely, positively, 100% draw calculates 57. .. a5??????????? GAME OVER. Mind-boggling; 2200+ Elo chess computers. M4-50 crushes Atlanta in the head to head 4-0. An atrocious Atlanta “achievement”. M4-50 has a good chance to finish .500: now 5.5-6.5.

[Event "Fall2017"]
[Black "Atlanta"]
[Date "Nov 4, 2017"]
[Result "1-0"]
[Round "36"]
[White "M4-50"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Ne2 O-O 6.a3 cxd4 7.exd4 Bxc3+ 8.Nxc3 d5 9.cxd5 exd5 10.Bg5 Re8+ 11.Be2 Bg4 12.f3 Be6 13.Nb5 Nc6 14.Bxf6 Qxf6 15.Nc7 Bf5 16.O-O Nxd4 17.Nxe8 Rxe8 18.Bd3 Bxd3 19.Qxd3 Ne2+ 20.Kh1 Nf4 21.Rae1 Rf8 22.Qb3 b6 23.g3 Ne6 24.Qxd5 Qxb2 25.Re3 Qf6 26.Qb7 Qd4 27.Rfe1 Qa4 28.Qe7 Re8 29.Qd6 h6 30.Qd1 Qc6 31.Qd3 Qb7 32.Kg2 a6 33.Re4 Rd8 34.Qc3 Rc8 35.Qd2 Qc6 36.Qe2 b5 37.Rd1 Re8 38.Qe3 Rc8 39.Re5 Qc3 40.Kg1 Qc2 41.Qd3 Qxd3 42.Rxd3 Rc2 43.f4 g5 44.f5 Nc5 45.Rdd5 Nb3 46.Rd6 Kh7 47.Re7 Kg7 48.Rdd7 Nd2 49.Rxf7+ Kg8 50.Rg7+ Kf8 51.h3 Nf3+ 52.Kf1 Rd2 53.Rgf7+ Kg8 54.Rxd2 Nxd2+ 55.Ke2 Kxf7 56.Kxd2 h5 57.Kc3 a5 58.g4 hxg4 59.hxg4 Ke7 60.Kd3 Kd7 61.Kd4 Kd6 62.Ke4 a4 63.Kd4 Kc6 64.Kc3 Kc5 65.f6 Kd6 66.Kb4 Ke6 67.Kxb5 Kxf6 68.Kxa4 Ke6 69.Kb5 Kd7 70.Kc5 Kc8 71.Kd6 Kb7 72.Ke5 Kc6 73.Kf5 Kb5 74.Kxg5 Ka4 75.Kf4 Kxa3 76.g5 Kb3 77.g6 Kc4 78.g7 Kd3 79.g8=Q Kd4 80.Qb3 Kc5 81.Ke5 Kc6 82.Qd5+ Kc7 83.Qb5 Kd8 84.Kd6 Kc8 85.Qb4 Kd8 86.Qb8# 1-0
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