On Mar 6, 2:44 am, Sanny wrote:

In this game Normal level sacrificed its Rook for a Bishop was it a
correct Move?

Sanny, you may have missed it, but in this
game White (that was me) had a very strong
attack on the enemy King. The Rook sac'
you mentioned was necessary to fend off the
attack.


19.... Rd8xd5{116} I think if it took d5 with Pawn it there could be a
Mate by White.

Then Help Bot Sacrificed its Rook for a pawn Was that a Correct Move
by Help Bot?

Just before this sacrifice, I misjudged the
GetClub program's counterplay-- its potential
attacks on my own King. I over-reached a bit,
and rejecting lines which clearly might allow
a perpetual check, I decided to go for this sac'.


26. Rc5-c6{254}

In the end game Normal had (1 Bishop with 2 pawns) Vs (4 Pawns) Still
Help Bot was able to win.

Sounds like this help bot fellow is a very tricky
guy! :D


In this game Help Bot was Lucky as Normal position was in such a
position, that it has to sacrifice its Rook for a Bishop Still it
managed to call a end Game with (Bishop + 2 Pawns) vs (4 Pawns)


A strong chess engine like Rybka would have
beaten me easily in such a position. Two pawns
are simply not enough compensation for a Bishop.

What happened at the end was that the Bishop
got tied down stopping a passed pawn, and the
King-- well, we already know that GetClub will not
move its own King far out of a corner, no matter
what. Only because of that titanic flaw was I able
to eventually win the K & pawns vs. K & B &
pawns ending; my real threat was to trade off all
the remaining Black pawns, for a mere draw (K vs.
K & B, no pawns left).

-----------------------------------------------------------------------

So, where did I go wrong? When the program
offered up a trade of Queens I should have jumped
for joy, not played the ridiculous move Rc5.

Later on, I mistakenly thought I "had everything
covered", only to hang my e2 pawn to a Queen
check I had seen coming. Doh! At this point,
my hopes for a "pawn roller" up the middle were
smashed; all my passed pawns were isolated,
and therefore, weak. After the computer played
....Be3, I tried to finagle a series of checks which
would end in a Queen fork winning that piece,
but it wasn't quite there. That's when I knew my
only hope was the Hindenberg-sized flaw in the
program's endgame, its King-glued-to-a-corner
issue. I traded Queens and presto-- a lost (or
perhaps barely drawn) ending became a win.


-- help bot