notyetagm: 19 ?
 click for larger viewThis is the position after Black has just played 18 ... ♕c5xc3?!, capturing a White pawn on c3 *but* also dangerously <LINING UP> his <UNDEFENDED> Black c3-queen with the White d3-bishop, creating the prerequisite White-piece-lined-up-with-Black-piece for a possible <DISCOVERED ATTACK>. White realizes that he can create said <DISCOVERED ATTACK> by moving his White h4-queen onto the g3-square with 19 ♕h4-g3?, but this move does not really threaten anything and just drops the White g5-knight. What is the problem? The problem is that when the White h4-queen arrives on g3, it does *not* create a <SECOND THREAT>. The threat of ♕h4-g3 needs to be *augmented*, that is, White needs the arrival of the White h4-queen onto g3 to threaten something besides the creation of the <DISCOVERY CHAIN> White g3-queen + White d3-bishop + <UNDEFENDED> Black c3-queen. Here is the key: <VISUALIZE> the White h4-queen on g3. What other squares might make a good <SECOND TARGET>. The g6-square stands out, as it is a square that can be reach by the White queen from g3 *and* is near the enemy Black e8-king. Now what <FORCING MOVE> does White have at his disposal that could make the g6-square a <SECOND TACTICAL TARGET>? 19 ♘g5xf7!! 19 ♘g5xf7!! 1-0
 click for larger viewThe point is that the brilliant 19 ♘g5xf7!! has created a <SECOND WEAKNESS>, the Black king in general and the g6-square in particular. After 19 ... ♔e8x♘f7, White *now* plays his h4-queen onto the g3-square with 20 ♕h4-g3 and *now* this queen move is a <DOUBLE THREAT>. (CONTINUATION)
19 ... ♔e8x♘f7 20 ♕h4-g3
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 click for larger viewWhite now has *two*, count'em *two* threats:
1) 21 ♕g3xg6#
2) 21 ♗d3xg6+, 22 ♕g3x♕c3 |