Affordable Computer Chess Tournament - QUARTER-FINALS

TracySMiller · Post by **TracySMiller** » Mon Apr 02, 2018 3:23 am

Both computers played almost flawless chess, each with just 1 mistake and no blunders. It resulted in a Rook and pawn endgame draw. Here's the final position:

[fen]5R2/6r1/8/7P/4k2K/5p2/8/8 w - - 13 83[/fen]

RS Chess Master maintains a slim 2.5-1.5 lead. Do we have an upset in the making? Still a long way to go.

Here's the game: https://lichess.org/ImT6S027#0

As a reminder, here is my spreadsheet with the tournament standings: https://docs.google.com/spreadsheets/d/ ... sp=sharing

TracySMiller · Post by **TracySMiller** » Tue Apr 03, 2018 2:26 pm

This was a shocking game. RS Champion 2250XL built up a nice advantage and should've won, but inaccurate moves frittered away its lead, and we were left with what should've been an easy draw. But no, yet more inaccurate moves and the RS Chess Master played a more accurate endgame to take a 3.5-1.5 lead. Upset in the making!

[fen]8/8/5p2/K4k1p/P6P/8/8/8 w - - 0 61[/fen]

Here's the key position. Every move in the endgame matters. If Black plays Kg4, the draw is still intact. But after Ke5, it's Mate in 23 for White.

Here's the game: https://lichess.org/Xyj0yFvf

TracySMiller · Post by **TracySMiller** » Wed Apr 04, 2018 1:40 pm

The RS Champion 2250XL comes roaring back with a nice tactical victory. It's nice to see a King pawn opening again. RS Chess Master makes a huge blunder here:

[fen]5k2/1R6/8/P4Kp1/rP4Bp/7P/3b4/8 w - - 5 63[/fen]

Things are already pretty tough for Black, but the correct move here is Rxb4. After Kg8??, however, there's no hope.

Here's the game: https://lichess.org/HhUnXfO8

lexman · Post by **lexman** » Tue Apr 10, 2018 6:35 pm

Exciting match! The RS Chess Master is a mysterious machine with some testing suggesting it may be a GK2100 clone rather than a GK 2000, but this is controversial and contested. I think this will be a close match and while the XL2250 may win I think the match score may only be 7.5 -5.5 in its favour, largely due to a slightly faster processor. Looking forward to the remaining games!

TracySMiller · Post by **TracySMiller** » Wed Apr 11, 2018 1:42 pm

The RS Champion 2250XL evens the match with this tactical overwhelming of the RS Chess Master. White made a very dubious exchange sacrifice here:

[fen]r5k1/pp3ppp/1q2pn2/1N1p4/2nP4/P2QPN2/1PR2PPP/6K1 w - - 1 18[/fen]

I'm not sure what the RS Chess Master was thinking here. To my eyes, there's no good rationale for RxN here, and SF agreed, sending the evaluation from 0.8 to over 5.0 for the RS Champion 2250XL.

Here's the game: https://lichess.org/bKuY91Sq

TracySMiller · Post by **TracySMiller** » Wed Apr 11, 2018 1:48 pm

The RS Chess Master retakes the lead with this amazing game where RS Champion 2250XL looked to have a winning Kingside attack, only to see it peter out and the RS Chess Master now leads 4.5-3.5 in this crazy match.

[fen]4rk2/5p1R/p1p1p3/q1N2p2/2Pb4/1P5Q/5PPP/6K1 w - - 2 31[/fen]

Here White makes a huge blunder with Qh6+. Instead, Nd7+ is much stronger, but after the Queen check, SF analysis favors Black (RS Chess Master) by over 7.0!

Here's the game: https://lichess.org/9Vyw0BIY

TracySMiller · Post by **TracySMiller** » Sat Apr 14, 2018 11:19 pm

The RS Champion 2250XL ties the match again with this tactical gem. After 27...c4, White can't take the pawn with the Queen because of mate in 6.

[fen]5rk1/1p2p3/pq1p3p/3Pb1p1/1Pp1P3/PRNQ3P/2P2rP1/R6K w - - 0 28[/fen]

But White takes the pawn anyway, so Mate in 6.

Here's the game: https://lichess.org/gO2s8jzj#0

TracySMiller · Post by **TracySMiller** » Sun Apr 15, 2018 12:31 am

The RS Champion 2250XL takes the lead with its second straight tactical drubbing of the RS Chess Master. I don't think I've ever seen a game get so tactically complex so quickly. Look at this position:

[fen]rnb1r1k1/pp3ppp/8/3q4/4nB2/3BPN2/P1Q2PPP/R4RK1 w - - 0 16[/fen]

White takes advantage of Black's lack of development to play 16. Ne5!. So many tactical traps here, and White calculates them better than Black.

Here's the game: https://lichess.org/pg845KnZ

TracySMiller · Post by **TracySMiller** » Sun Apr 15, 2018 2:53 am

RS Champion 2250XL is really on a roll now, with its third straight victory over the RS Chess Master. In the following position, RS Chess Master, already in a tough spot with Black's advanced a-pawn, makes a fatal decision:

[fen]2q3k1/6p1/4p2p/1Q1pNp2/2nP4/p1P1P2P/5PP1/6K1 w - - 0 31[/fen]

Here White played NxN. Why on earth would it trade a piece needing every resource to try to stop that passed pawn? RS Champion 2250XL opens up a 6.5-4.5 lead in the match.

Here's the game: https://lichess.org/G36e9RwT

TracySMiller · Post by **TracySMiller** » Tue Apr 24, 2018 2:25 pm

The RS Champion 2250XL continues its remarkable run with this nice win, moving to within one point of winning the match. Another very accurate game from the unit, with just one mistake and no blunders. Here's a position where the tide began to turn in White's favor:

[fen]1r4k1/5rb1/pq4pp/p1p1p3/8/1PPPR1P1/Q2N3P/R5K1 w - - 5 31[/fen]

Here Black doubled its Rooks with Rf8, but the more accurate move is the aggressive 31...c4, keeping up the pressure by attacking White's hanging Rook. RS Champion 2250XL leads 7.5-4.5, having taken 6 of the last 7 points.

Here's the game: https://lichess.org/Ui0Qdjt4

TracySMiller · Post by **TracySMiller** » Sat Apr 28, 2018 3:26 am

The RS Champion 2250XL wins the match in fine style with yet another tactical crush. The unit really got moving after it's slow start, winning 7 of its last 8 games. Here's where Black really put the screws to White:

[fen]r1b1r1k1/p3bppp/1qp2n2/1p1n4/5P2/2PB1N2/PPQBN1PP/3RK2R w K - 6 16[/fen]

White HAS to play h3 to prevent Black's next move. Instead, White plays Ng5, and it's all over after Black plays Ng4. White has to shed material to get out of the jam.

Here's the game: https://lichess.org/q6a6bWOk#0

Here's the updated spreadsheet with the tournament results thus far: https://docs.google.com/spreadsheets/d/ ... sp=sharing

TracySMiller · Post by **TracySMiller** » Sat Apr 28, 2018 3:29 am

Spacious_mind predicted 8.5-5, and paulwise3 predicted 9-4. Since the actual result was 8.5-4.5, spacious_mind gets the point by the slimmest of margins.

paulwise3 · Post by **paulwise3** » Fri May 04, 2018 6:04 am

Hi referee,

Objection!!

8.5 - 5 is an impossible score, the sum of both figures should be a whole number!
So I declare myself the winner of this bet...!

Let the reward come my way regards,
Paul

TracySMiller · Post by **TracySMiller** » Fri May 04, 2018 1:53 pm

Great point. Paulwise3 is awarded the point on the technicality. He is now tied with spacious_mind at one point apiece.

The next match is rolling right along, with the RS Master 2200X leading Excalibur Ivan 4.5-1.5. I'll try to get the games uploaded later today.

spacious_mind · Post by **spacious_mind** » Sun May 13, 2018 10:49 pm

TracySMiller wrote:Great point. Paulwise3 is awarded the point on the technicality. He is now tied with spacious_mind at one point apiece.

The next match is rolling right along, with the RS Master 2200X leading Excalibur Ivan 4.5-1.5. I'll try to get the games uploaded later today.

Objection !!

It was a typo!! I promise guv! I missed adding the 4!!

I am joking, nice matches Tracy and happy to take the draw with Paul

Regards

HIARCS Chess Forums

Affordable Computer Chess Tournament - QUARTER-FINALS

RS Chess Master leads 2.5-1.5

RS Chess Master takes a 3.5-1.5 lead

RS Chess Master leads 3.5-2.5

Match is tied 3.5-3.5

RS Chess Master leads 4.5-3.5

Match is tied 4.5-4.5

RS Champion 2250XL takes a 5.5-4.5 lead

RS Champion 2250XL leads 6.5-4.5

RS Champion 2250XL leads 7.5-4.5

RS Champion 2250XL wins 8.5-4.5