Maybe the engine feels that under-promoting to a Rook scores more Coolness points.
Why is cxd8=R+ better than cxd8=Q+?
Sort:
Dec 4, 2022
0
#3
i think because the computer doesn't like losing queens, so it prefers losing a rook
Dec 4, 2022
0
#6
zen516 wrote:
why didn't you promote it to a knight or bishop
Because I love my queen 
Promoting to a B or N would allow black to take my Q for free (witch check!)
blueemu wrote:
Maybe the engine feels that under-promoting to a Rook scores more Coolness points.
fax
tho i have my settings to auto promote to queen
Looking at the picture again, there are even more absurd things going on.
For example, "cxd8=Q+ is an inaccuracy (+2.28)" is shown above, and below (at the actual line) there is 2.76 for the same move.
Also, the top 3 moves are listed in the wrong order, Qxd8 is in first place even though its eval (2.76) is lower than 3.04 for the rook promotion.
Dec 4, 2022
0
#9
magipi wrote:
1 ==> For example, "cxd8=Q+ is an inaccuracy (+2.28)" is shown above, and below (at the actual line) there is 2.76 for the same move.
2 ==> Also, the top 3 moves are listed in the wrong order, Qxd8 is in first place even though its eval (2.76) is lower than 3.04 for the rook promotion.
Nope. It's now Black to play ...
1 ==> The 2.76 is shown for the black line starting with with Qxd8 (2.28 is for the current white move)
2 ==> The rating is in increasing order because it's black to play...
You gonna lose it immidiately, so think like a machine which is better? losing 5 points or 9 points?
Anything under a rook wouldn't give check so it wanna keep the loss at minimum
ExonArch wrote:
You gonna lose it immidiately, so think like a machine which is better? losing 5 points or 9 points?
Anything under a rook wouldn't give check so it wanna keep the loss at minimum
Probably just my imagination. For quite some time I have had an unsubstantiated thought floating around through my brain. A chess engine is in love with power moves. Promote to Q or R, it will pick the Q. Can mate with a pawn or bishop, it will choose the bishop.
Your statement appears to correlate with my perhaps strange thinking.
bigD521 wrote:
ExonArch wrote:
You gonna lose it immidiately, so think like a machine which is better? losing 5 points or 9 points?
Anything under a rook wouldn't give check so it wanna keep the loss at minimum
Probably just my imagination. For quite some time I have had an unsubstantiated thought floating around through my brain. A chess engine is in love with power moves. Promote to Q or R, it will pick the Q. Can mate with a pawn or bishop, it will choose the bishop.
Your statement appears to correlate with my perhaps strange thinking.
edited to add - As far as Game Review goes, I have viewed it as convenience for a quick assessment. However, anything which has any real importance I prefer normal analysis. Feel it is more accurate. True or not.
Dec 5, 2022
0
#13
I'm pretty sure it's not anything to do with the engine prefering to capture a queen over a rook.
It's that the engine is evaluating both lines independently, at different depths. Even though humans understand that the two lines quickly transpose, an engine isn't trained to think that way and therefore continues on, devoting different amounts of computation to both lines, and consequently getting somewhat different results. If it's given more time to think, the two evaluations should equal out, but in these whole-game reviews, you're only getting a snapshot of what the engine thinks after spending a brief amount of time with each move.
Amusing, though! (And a good reason to take the engine's delcarations of "inaccuracy," "mistake," "brilliant," etc with a grain of salt.)
In this game SF says that R promotion is better than Q....
[ right-click "open image in new tab" to see it fully ]
Hmmm ok, but why?
Edit ...
I think I got it!
SF is a comp, and while humans know that the final outcome will be the same, the comp sees that I'll lose a Q instead of a R, because it doesn't take into account it was a promotion the previous move!
So funny!