Lucas et al.
The engines that I use for analysis are Deep Rybka, Fritz and ChessMaster 9000.
Basically I set them for 'infinite analysis' when looking at a game and the
window for this is usually towards the bottom on the page. However, this may
vary according to which engine you use. At the end of each horizontal line of
analysis there is an evaluation, say +1.67 or -0.82, and the higher the figure
the more it is in White's favour. 0.00 is equal and minus numbers are in Black's
favour. Anything near plus or minus one is roughly the worth of an extra Pawn.
Anything in excess of plus or minus five (the value of an extra Rook) and the
computer wonders why you (or someone) are playing on!
I'm not technically savvy with VH software as I'm fully-sighted. If you need
advice that's more particular than this please check with other group members
especially Chris Ross.
Crafty is an engine that I'm unfamiliar with so I can't comment. However, in
Milborrow-Ngozi Black leaves theory with 3...Bd6. It's a poor move and has not
been played in master chess according to my databases. Chess engines can prove
it is a poor move but there will be no game references to find.
Regards,
Tyson
On 11 February 2016 at 12:39 Lucas Radaelli <lucasradaelli@xxxxxxxxx> wrote:
Thanks for this commented game, I will reproduce it in my board as soon as
I get home.
Has anyone written something about using chess engines to analyze games?
You mention several times possible suggestions made by the chess engines,
could you point to links of the ones that you are using? Do you use them with
winboard or via the terminal?
I tested here crafty, which was interesting to get next moves and moves
that were part of opening books, but the analyze mode kept spitting possible
moves while he calculate stuff and was a little bit hard to follow the
notation.
On 10/02/2016 18:26, mordue andrew wrote:
> >
Hello all.
Another annotated game for you. The critical point occurs at Black's
23rd. Have a close look and decide what you would play for Black. I'll tell
you now that Black chose the very obvious move and regretted it. You'll have
a treat if you stop and work out what happened afterwards without looking at
the game first!
Best wishes,
Tyson
(6) Milborrow,A – Ngozi,K [C65]
22.10.2015
[Mordue]
1.e4 e5
2.Nf3 Nc6
3.Bb5 Bd6?!
[This is a clumsy move and is not theoretically recommended. The
Bishop does protect the e5 Pawn but otherwise it is poorly placed, has
little scope and obstructs the d7 Pawn . Moreover it makes a statement that
the player lacks opening knowledge. Viable moves are 3...a6, 3... Bc5,
3...Nd4, 3...Nge7, 3...f5 , 3...g6 and the currently fashionable 3...Nf6,
the Berlin Defence.]
4.0–0 Nf6
5.Bxc6
[I wouldn't rush to play this move even though I do play the
Exchange Variation with 3...a6 4 Bxc6. The immediate 5 d4 threatens 6 Bxc6
followed by 7 dxe5 forking two pieces, another reason why 3...Bd6 is a poor
move. However, in reply to the text Black does better to go 5...dxc6 opening
lines for his Queen and other Bishop. By answering 5...bxc6, even though
recapturing towards the centre is strategically recommended, Black remains
with a cramped position and his Queen's Bishop has no prospects. The
difference is enough for the computers to evaluate the position after
5...dxc6 as +0.05 and after 5...bxc6 as +0.50!]
5...bxc6?!
6.d4 Qe7
[The alternative is 6...Nxe4 but after either 7 Qd3 f5 (not 7...Nf6
8 dxe5 with the afore-mentioned fork) 8 dxe5 White is doing well. Note that
7 Qd3 controls a6 preventing Black from developing his Bishop there. Also 7
Re1 is possible but after 7...f5 8 dxe5 Bc5 White has the attack on f2 to
sort out. and he may lose the initiative while he does so.]
7.Bg5
[The engines prefer 7 Re1 and 7 Nbd2 but the text adds more pressure
on to the opponent. Indeed it promptly produces an error. Another
alternative is 7 dxe5 Bxe5 8 Nxe5 Qxe5 when White could try 9 f4 pushing the
Queen around - 9...Qxe4 loses to 10 Re1 – but 9...Qc5+ followed by 10...Nxe4
may be okay for Black. Hence the preliminary 9 Nc3 before 10 f4 bearing mind
that Black can't take on e4 because of the pin with Re1.]
7...Qe6?!
[An awkward looking move. I can understand the desire to unpin, and
indeed I heartily endorse unpinning as soon as reasonably possible. However,
I don't think Black has anything specific to worry about on the h4-d8
diagonal particularly as he has a Pawn on c6 preventing Nc3-d5.
Instead Black would do better to get on with his development. I
suggest 7...0–0 and Deep Rybka mentions both 7...Ba6 and 7...Rb8. I like the
latter because it hits the b2 Pawn while the former allows immediate
Queenside castling. Whether Black wants to go Queenside with his King is up
for debate, but I will add that in the game Black's Queen's Rook and Bishop
make precisely one move between them – the losing move!]
8.Nc3 0–0
9.Qd2
[I prefer the line mentioned previously, namely 9 fxe5 Bxe5 10 Nxe5
Qxe5 11 f4 and if Black goes 11...Qc5+ 12 Kh1 he has to concern himself
about 13 Bxf6. If Black had played 5...dxc6 then he would have 12...Ng4
threatening 13...Nf2+ in this variation and with some activity.
However, there is nothing wrong with the text move. Maybe White
could consider going a square further with 9 Qd3 but after 9...a5 Black
threatens 10...Ba6 skewering.]
9...Re8
[Previously Black playing ...exd4 and taking the next move on e4
resulted in losing material after White's Re1. Here 9...exd4 10 Nxd4 Nxe4??
leaves both Queens attacked but after 11 Qe3 Black is losing a piece.]
10.Rfe1 Qg4?
[It rarely pays to wander with your Queen when you haven't completed
development. I can't even guess what Kwesi 's idea was here. As a possible
refutation I pointed out 11 h3 Qh5 12 g4 Qg6?? 13 Nh4 trapping the Queen. Of
course Black has 12...Qxh3 but my point is that White can gain useful tempi
on the errant Queen in some lines.
Now Andrew begins a series of obvious exchanges that leave White
with a space advantage and active pieces, and leave Black with weak Pawns,
exposed major pieces and a draughty King. A high price to pay for one poor
move.]
11.dxe5 Bxe5
12.Nxe5 Rxe5
13.Bxf6
[Here 13 Bf4 is a simple skewer winning the c7 Pawn, but I'd play
the text as well. Extra Pawns are nice but exposed Kings create
psychological pressure for the defender. Also after 13 Bf4 Re8 14 Bxc7 Black
has no doubled Pawns but after the text he has two pairs of them!]
13...gxf6
14.f4
[Harassing the enemy Rook and ruling out ...Re5-g5 as a defence to
the forthcoming Rook lift. Black's Rook has a choice; retreat down the
e-file or go left or right and risk being out of play. Kwesi chooses to go
left but his Rook seems to be exposed here as well.]
14...Rh5
15.Re3 Qe6
[Losing two tempi but better than 15...Qxf4?? 16 Rg3+or 15...Qh4??
16 Rh3 Qg4 17 Rg3 which both lose the Queen. Black can move his King first
but delays the decision until he has some idea of which direction is
preferable.]
16.Qe2 Rh6?
[Deep Rybka prefers this to 16...Rh4 but to me it seems better to
control g4. The text allows Andrew to easily penetrate down the g-file.]
17.f5 Qe5
18.Qg4+ Kf8
[Black can play 18...Kh8 because he can defend the mate threat on g7
after 19 Rg3 with 19...Qc5+ 20 Kh1 Qf8. However, he remains very passive and
it's difficult to see how the h6 Rook ever gets back into play.]
19.Rg3 Ke7
20.Qg7
[A bit precipitate. 20 Rd1 first is probably sensible.]
20...Qd4+
21.Kh1 Rh4
22.Rd1 Qf2?
[This psuedo-active move loses control of lots of important squares.
Better were 22...Qc5 or 22...Qe5. The latter begs the question whether the
Queen should have gone to d4 in the first place.]
23.Qg8?!
[White should play 23 e5! If 23...Qxf5 24 exf6+ Qxf6 25 Re3+ wins
the Queen, while 23...fxe5 24 Qxe5+ Kf8 25 f6 threatening 26 Qe7 mate is
even worse. Andrew's actual choice has a point though as he threatens 24
Rg7.
Time for a deep think before reading on.
Now Kwesi could justify his previous play in one of two ways.
Firstly, 23...Qf4 to meet 24 Rg7?? with 24...Qxh2 mate. Secondly, the
spectacular 23...Ba6 because 24 Qxa8 is met by Qxg3. After 25 h3 Black has
an immediate draw by perpetual check with 25...Rxh3+ 26 gxh3 Qxh3+ 27 Kg1
Qg3+ when the White King can't go to f1 because of the Bishop on a6!
Now the latter line involves a little bit of imagination but clearly
Black posted his Queen on f2 hoping to take advantage of the pinned h2 Pawn.
So by the same token he should be asking himself "Why has my opponent
allowed me to play 23...Bb7 with a free tempo gain on his Queen?" Once you
find the answer you realise that 1) you should have trusted your opponent
and 2) it was worth doing deeper analysis and discovering the vital
difference between 23...Bb7 and 23...Ba6.]
23...Bb7??
[If you still haven't worked out what's going on here yet then stop
and start analysing right now!]
24.Rxd7+!!
[It's a forced mate in ten moves including this move].
24...Kxd7
25.Qxf7+ Kd6
[The vital difference between 23...Bb7 and 23...Ba6 is that in the
game after 25...Kc8 there's no flight square on b7 so 26 Rg8 is immediate
mate. Now the King has to run the gauntlet and no Black piece contributes to
the defence.]
26.Qxf6+ Kc5
[Going backwards just runs into mate in two after 27 Rg7+.]
27.Qe5+ Kb6
[A bit of calculation is needed here. If 27...Kb4 28 a3+ Kc4 29 b3
mate. Alternatively if 27...Kc4 28 b3+ Kb4 29 a3+! Kxa3 30 Qa5+ Kb2 31 Qa2+
Kc1 32 Qb1+ Kd2 33 Qd1 mate. It would have been wonderful to see this!]
28.Na4+ Ka6
29.Nc5+ Kb6
[If 29...Qxc5 30 Qxc5 - the threat is 31 Ra3 mate – 30...Bc8 31
Qxc6+ Ka5 32 Ra3+ Kb4 33 Ra4 mate. Or 29...Ka5 30 Qc3+ Kb5 31 a4+ Kb6 32 Qb4
mate. Finally 29...Kb5 runs in the same reply as in the game.]
30.Rb3+ Ka5
31.Nd3+
[Better moves were 31 Qxc7 mate and 31 Qc3 mate. White is still
mating shortly after the text but at this point Black threw in the towel.]
1–0
Text ends.
>
