I don't understand the move g5

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Knights132

Here is a game that I recently played (15|10 time control). The opening was the caro-kann advance with f4, but that is not important. I don't understand the move g5. Further information provided in analysis. I was black in the game.

As a side note, could someone provide me with a link to the correlation between chess.com rating system and USCF rating system. I know it's there I just cannot find it anymore.

Knights132

Analysis of g5 is on move 20 and 29, sorry.

EscherehcsE

For move 20, I believe the main idea of the g5 move is to isolate White's e-pawn. Black will also be saddled with an isolated h-pawn or g-pawn, but he can easily bring up his king to protect it. White's isolated e-pawn and backward c-pawn will allow Black to put pressure on these two weaknesses. At least that's my patzer take on it.

Edit - For move 29, it's even easier to understand. Black is two pawns up. 29...g5 will isolate Black's e-pawn and temporarily protect Black's knight until the knight can relocate. Black will have three isolated pawns under pressure: the b-pawn, e-pawn, and h-pawn.

Mal_Smith

https://www.chess.com/forum/view/general/fide-ratings-vs-chesscom-ratings-explored

ArtNJ

All of the above said, 20 ... rc4 was a fine move and perhaps the best move.  Black has positional dominance, and there is more than one good plan. 

Knights132

 I think that on move 20, g5 makes sense because the pawn is truly isolated (nothing can defend it but the king. The knight on e4 makes it easier to attack the pawn with Nh4-g6. Move 29 is more of a simplification on the position. If I am able to trade queens, how would I play an IQP position?

 

Preggo_Basashi

Another common idea of g5 is the king can walk up the board on the kingside.

Preggo_Basashi
Knights132 wrote:
As a side note, could someone provide me with a link to the correlation between chess.com rating system and USCF rating system.

 

Knights132 wrote:

If I am able to trade queens, how would I play an IQP position?

 

You ask really random questions.

Here's the USCF vs chess.com thing. You can find it easily by using google by the way.

https://www.chess.com/blog/smarterchess/chess-rating-comparison-2016

 

As for queenless IQP, it depends... are you the one with the IQP or is your opponent?

In very general terms the pawn gives its owner active mid game play at the cost of being a long term structural defect. In an endgame this is a liability. In a minor piece endgame it's not so bad. In a heavy piece endgame the side with the IQP can be close to lost.

The queen is similar. The queen represents dynamic play, and when queens are traded, long term advantages and disadvantages are highlighted (like material deficit or pawn structure defects).

With those things in mind, you'll have a general idea of how to play, but mostly you should look at example games of how an IQP owner can attack (particularly sacrifices near the king) and how the other player can win a heavy piece endgame.

 

There are many games showing attacking ideas, but this game is probably the most famous example of a bad/losing endgame.

 

subhankhurram

You can do stockfish analysis.