WHITE TO MOVE

On the ICC (Internet Chess Club), there was an interesting game Nanomaster - PaulMuadDib. 

I had the white pieces and managed to win with an impressive combination.

White to move

The full game can be seen here. 

WHITE TO MOVE

White to move

Check your solution on Apronus.

THE ATTACK

I had white pieces.

Eintalu - Rettuc

[Event "Match"]

[Site "www.chess-mail.com"]

[Date "2024.01.25"]

[Round "1"]

[White "Nanomaster"]

[Black "Rettuc"]

[Result "1-0"]

[WhiteELO "2300"]

[BlackELO "2220"]

[Opening "Queen's pawn: Yusupov-Rubinstein system"]

[ECO "A46"]

     1.      d4           Nf6      

     2.     Nf3            e6      

     3.      e3           Nc6      

     4.     Be2           Be7      

     5.     O-O           O-O      

     6.      b3            b6      

     7.     Bb2           Bb7      

     8.      c4            d5      

     9.     Nc3            h6      

    10.      a3          dxc4      

    11.    bxc4           Bd6      

    12.     Qc2           Re8      

    13.    Rfd1            e5      

    14.      c5          exd4      

    15.    exd4           Bf8      

    16.      d5           Ne5      

    17.      c6           Bc8      

    18.      h3           Bc5      

    19.     Nb5          Nxf3+     

    20.    Bxf3            a6      

    21.      d6          axb5      

    22.      d7           Re6      

    23.    Bxf6          Rxf6      

    24.     Re1          Bxd7      

    25.    cxd7          Qxd7      

    26.    Bxa8          Bxf2+     

    27.    Qxf2          Rxf2      

    28.    Kxf2            c5      

    29.    Rad1           Qa7      

    30.     Bd5            c4      

    31.     Re8+          Kh7      

    32.     Rf8     

            1-0

Eintalu - Rettuc, Chess-Mail 2024

FIND BLACK'S BEST CONTINUATION

Black to Move

Check your solution on Apronus. 

THE GAME LASTED ONLY 13 MOVES

I had black pieces. We played on the platform Chess-Mail. 

The game was finished on the 13th move with the Greco's mate.

[Event "Match"]

[Site "www.chess-mail.com"]

[Date "2024.01.12"]

[Round "1"]

[White "Geodad5"]

[Black "Nanomaster"]

[Result "0-1"]

[WhiteELO "2030"]

[BlackELO "2300"]

[Termination "6"]

     1.      e4            e5      

     2.     Nf3           Nc6      

     3.      d4          exd4      

     4.    Nxd4           Bc5      

     5.     Nb3           Bb6      

     6.     Bd3            d6      

     7.     O-O           Qh4      

     8.     Nc3           Nf6      

     9.     Na4           Ng4      

    10.      h3          Bxf2+     

    11.     Kh1           Qg3      

    12.     Bf4          Qxf4      

    13.    hxg4           Qh6+     

            0-1

The move 9 Na4?? was a grave mistake. White wanted to eliminate Black's bishop b6, which was attacking the pawn f2. 

The correct move was 9 Qd2! with equal play.

In the game, after 9 Na4?? Ng4! the pawns f2 and h2 were both under attack. White had no time to capture on b6, and White's both knights were on the wrong flank.

9 Na4?? Ng4!

The result was a classical Greco's mate:

Greco's mate

The pattern of the combination that starts with 9...Ng4 is standard.

THE GAME LASTED ONLY 10 MOVES

Gegonz - Nanomaster 
Chess-mail, 2023-2024

I had black pieces.

It is not a fork

If Black takes the knight a5, then White takes the knight d2.

If 10...Bxa5, then 11 Kxd2.

The position after 10...Ne4!

After the move 10...Ne4!, two White's pieces are attacked at once.

However, this is not a fork because two Black's pieces are involved in the combination.

Such a combinatorial motif seems common in chess but has not received due attention. Such a tactical motif does not even have a name (or well-known name).

Yes, it is zwischenzug.

However, here, it is a particular kind of zwischenzug. Zwischenzug is used here to defend against the opponent's threat and create a new threat - so that, in sum, two threats against the opponent will appear on the chessboard.

And no, it is not the roentgen motif.

In the case of the roentgen motif, two opponent's pieces are suddenly attacked after one move, while the attacker's two pieces are involved. However, in our example, one of the opponent's pieces was under attack from the very beginning.

Thus, it is neither a fork nor a roentgen. And it is too general to say that it is a zwischenzug merely. But after one move, two opponent's pieces are simultaneously under attack, similarly to a fork or a roentgen.