Going from 1800 - 2000 rating

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Pawn Endgames

Shouldering

The Floating Square

Undermining

The BreakThrough

Stalemates

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Minors and Pawns

Opposite Color Bishops

Same color bishops

Two Bishops vs King

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The Middlegame 

Static and Dynamic weaknesses

Passed pawns

Space Advantage

Psychology

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Rook vs Minor and Pawns

Rook vs  Bishop and multiple pawns

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Rook Endgames

R vs R+P on the 7th rank
​defending from the side

Defense attacking Pawns
​ from the rear

Rook and 2 pawns vs Rook

R and 2 separated Pawns vs rook