Monday, December 03, 2012

Practical chess tactic review


Black to move. How should Black proceed?

Source: ChessToday.net

13 comments:

Jose said...

Knight x g2

Jose said...

knight x g2 wining a knight

Anonymous said...

F4-H3

Anonymous said...

F4-H3

James I. Hymas said...

1 ... N:g2
2 R3e2 N:e1
3 R:a2 Nf3+
4 Kg2

If
2 K:g2 Rf:f2+
3 Kg1 Rg2+
4 Kh1 Rh2+
5 Kg1 Rag2+
6 Kf1 Bh3

The first line looks winning, but is there more?

Vivian said...

1. ... Ng2: looks crushing, but if there's a quick mate, I don't see it.

aam@fics said...

1... Nxg2
2. Kxg2 R8xf2+
3. Kh1 Rh2+
4. Kg1 Rag2+
5. Kf1 Bf3
6. any Rh1#

aam@fics said...

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pht said...

1. ... Nxg2

To grab a pawn must be better than Nh3+? Here the fork on the rooks enforces:

2. Kxg2 Rfxf2+

This beeing check is important, avoids rook-splitting Ne2.

3. Kg1 Rg2+
4. Kh1 (Kf1? Raf2#) Rh2+
5. Kg1 Rxh6

Black is up with 3 pawns and wins easily. The comparizon between the two kings is real fun! The bishop hasn't been in play yet, but comes strongly.

pht said...

To aam@fics:
Have you not overlooked that white still has a knight on g3?
Therefore Rh1?? can't be mate!

To both you and James I. Hymas:
I suspect it is the wrong idea to press that hard on white king, with Rag2+ and Bh3, since I see no quick mate here.

But clearly winning is to take first opportunity to regain the horse, and settle with a gain of 2 pawns.
Those 2 pawns are more than enough to win this game!

Then there is:
1. ... Nxg2
2. R3e2 (seems critical to me) Nxe1
3. Rxa2 Nf3+
4. Kg2
Well, white is better here too, but this line is less clear to me...

James I. Hymas said...

pht,

After actually setting up the position (rather than just looking at it, which I consider better practice) I don't see a defence after 6 ... Bh3 in my line.

If the Ng3 moves, then ...Rh1#

If the Ng3 doesn't move, then Re2#

So I think the critical line is what I thought was the main line anyway: 1 ... N:g2; 2 R3e2

James I. Hymas said...

Oops! Sorry!

In the line after 2 K:g2 if the Ng3 doesn't move after 6 ... Bh3, then it's not mate, but it's totally hopeless, e.g:

1 ... N:g2
2 K:g2 Rf:f2+
3 Kg1 Rg2+
4 Kh1 Rh2+
5 Kg1 Rag2+
6 Kf1 Bh3

a) 7 R1e2 R:e2+
8 Kg1 Rhg2+
9 Kh1 R:e3

b) 7 Rd1 R:g3+
8 Ke1 R:e3#

c) 7 Rc1 R:g3+
8 Ke1 Rg1#

Thoughts?

pht said...

To James I Hymas:
I agree with you.
As you say, it is not immediate mate, but the threat Rxg3 with discovered mate is so strong that white must sack heavy material.

Howevwer, it seems unlikely that white takes the knight in the first place.
So more interesting is probably to discuss the line:

1. ... Nxg2
2. R3e2
leading to an exchange of rooks, and black has just gained 1 pawn, so far.

2. ... Rxe2 (better than Nxe1 i think)
3. Rxe2 Bg4!
threating to take rook.
4. R move Bf3!
is protected by Rf8, protects Ng2, and prevents f pawn from moving.
I kind of like that position!
E.g. if open h-file then Rh8 and Ne1 could threat Rh1#.
Also g4 is possible here.