Puzzle of the week #337

Level: 
2-Knight
Chess Diagram: 

[Event "Puzzle #337"][Date "2018.02.25"][Result "1-0"][SetUp "1"][FEN "R1B4k/8/8/7K/8/8/p1pppppp/1Q6 w - - 0 1"]

This is a very unusual position. White has a huge material advantage even if black promotes one of his pawns into a Queen. It is white to move and your tasks are:
a) How was this position reached: during a game, as a possible variation from a game or an invented position? Explain your answer
b) White to move and mate in 2
c) What tactic should white use?

Total available points for this puzzle is 15. The answers will be published next time together with puzzle #338.

Puzzle #336 solution:
Game Esteban – Dominguez, Valladolid 1979. This week's best answers are by the top scorers:
a) We are in the middle game because at least both sides are developed
b) The center is closed because the pawns in the center (e4-e5, d5-d6) block each other

[Event "Puzzle #336"][Date "2018.02.18"][Result "1-0"][SetUp "1"][FEN "r4rk1/1b2bppp/2pp1n2/q2Pp3/4P3/2N1RN1P/B1P2PP1/R2Q2K1 w - - 0 1"]1. dxc6 Bxc6 (1... Qc7 2. cxb7) 2. Bxf7+ Rxf7 3. Rxa5

Correct solutions:
Coby, Mengbai, Lyvia, Eric, Matthew - 20 points
Joey - 18 points
Glyn, Jacey, Aiden - 15 points
Brian, Walter, Blake - 11 points
Itamar - 7 points
Lucas, Zhengyu - 5 points

Standings:
Matthew - 110 points
Eric - 105 points
Lyvia - 100 points
Coby - 89 points
Joey, Mengbai - 79 points
Aiden - 75 points
Glyn - 70 points
Zhengyu - 65 points
Brian - 61 points
Jacey - 56 points
Itamar - 52 points
Blake - 50 points
Lucas - 46 points
Walter - 39 points
Darius - 8 points
Chris - 3 points

Comment: 

Discovered check