King and Pawns Endgame Study

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In this forum, I would like to show an endgame study from a recent game I played.  The game itself wasn't great, (for myself or my opponent) so I will not be showing it.  The themes of this lesson are:

1.  Opposition:  When the Kings are in a position where there is only one square between them, and they cannot move forward, but must rather go around each other.  The player who moves into this position is said to "have" or "take" the opposition.  Note that opposition occurs not only when the kings are directly in front of each other, but diagonally as well.  Here is an example of opposition and how it can be used, not related to the example game I am about to show.

2.  Triangulation:  A method of reaching the same position where it is the other player's turn to move.  This is usually done to switch who takes the opposition by maneuvering the kings in a triangular movement.  This will be shown in the first example. Down, left, and diagonal up right OR diagonal down left, right, and up are 2 examples of this maneuver.

3.  Passed Pawns:  A pawn that cannot be prevented from moving forward by the opponent's pawns, but must rather be captured or blocked by a piece.  Here is one famous example of winning by creating a passed pawn:

4.  Promotion:  A pawn reaches the other side of the board and promotes to a Queen

5.  Underpromotion:  A pawn reaches the other side of the board and promotes to a Rook, Knight, or Bishop (this is illustrated in one line in the 2nd example)

Setup the position below, either in a Chess.com or Lichess Analysis Board or on a real chess board if you prefer that.  Be sure to turn off Engine Analysis.  If you would like you can go through it later with the engine.  It is White's turn to move.

If you haven't already, please enable the ability to draw arrows and highlight squares.

Identify all possible legal moves that white can play (not looking for the best moves yet, just all the moves) and draw arrows for each move.  Did you find all 5?

Now that we have identified each of White's possible moves, let's start to evaluate them, starting with all 3 King moves.  I have included most possible lines in the following example, but it may be helpful to go over them yourself with your analysis board as well.  Example 1:

As you can see, white could achieve a draw with any of the three king moves.  However, White had to play very accurately to achieve the draw; one little mistake was all it took for black to get the upper hand.

Next, we will analyze the move Pawn to a4.  Same as the last example, I have included most lines, but you may find it helpful to review them yourself in your analysis board.  Example 2:

Playing this move also resulted in a draw with accurate play.  Of course, both sides must be careful or the result could be devastating.

Lastly, let's take a look at Pawn to b4, which is the move my opponent chose.  Example 3:

And again, both sides had to be careful and play accurately, but b4 was also a draw with correct play.

I hope you found this study useful in helping you to better understand King and Pawn Endgames and how important concepts such as Opposition, Triangulation, Passed Pawns, Promotion, and Underpromotion can be.