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slacombe / monik

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False draw claims #1

Open tpoppins opened 6 years ago

tpoppins commented 6 years ago

Apparently Monik considers some endgames as draws by insufficient material and thus gets forfeited by the GUI (Cute Chess) when attempting to claim draw. KBKB is one such endgame, e.g.:

8/8/3k4/8/3bB1K1/7p/8/8 w - - 0 160

This is a position from an actual game Monik lost with Black during the ongoing 40/40 gauntlet. Making it play from that position we can see why:

>Monik 2.2.6 64-bit(393): new
>Monik 2.2.6 64-bit(393): force
>Monik 2.2.6 64-bit(393): b2b3
>Monik 2.2.6 64-bit(393): edit
>Monik 2.2.6 64-bit(393): #
>Monik 2.2.6 64-bit(393): Be4
>Monik 2.2.6 64-bit(393): Kh3
>Monik 2.2.6 64-bit(393): c
>Monik 2.2.6 64-bit(393): Bd4
>Monik 2.2.6 64-bit(393): Kd6
>Monik 2.2.6 64-bit(393): .
>Monik 2.2.6 64-bit(393): level 40 2 0
>Monik 2.2.6 64-bit(393): post
>Monik 2.2.6 64-bit(393): easy
>Monik 2.2.6 64-bit(393): time 12000
otim 12000
>Monik 2.2.6 64-bit(393): go
<Monik 2.2.6 64-bit(393): b2b3
<Monik 2.2.6 64-bit(393): (no pondering)
<Monik 2.2.6 64-bit(393): tellics set 1 Monik v2.2.6
<Monik 2.2.6 64-bit(393): tellics say Hello from Monik v2.2.6
<Monik 2.2.6 64-bit(393): 1/2-1/2
>Monik 2.2.6 64-bit(393): force
>Monik 2.2.6 64-bit(393): result 1-0 {White wins by adjudication: Invalid result claim}

Despite draw being the most likely outcome this is not a draw by insufficient material since theoretically either side could get mated. Here's one legal position that can arise after some moves from the previous position:

8/8/8/8/4B3/8/5K1b/7k b - - 0 1

Monik lost three games this way out of 500+ total.

slacombe commented 6 years ago

Thx for the info!