MESON Chess Problem Database

Problem Display
PID: 114289 (1B3b2/7K/7p/4ppkN/8/3P2P1/2Q5/3B4 w - - 0 1)

Agostini, Valerio

Canadian Chess Chat, 1982

1B3b2/7K/7p/4ppkN/8/3P2P1/2Q5/3B4

#2

7 + 5

6490 yacpdb 2009
5454 Near Snap 2014

SOLUTION

  • SOUND
  • Sets
    • 1...e4
      • 2.Bf4#
  • Tries
    • 1.Bxe5?
      • threat
        • 2.Bf4#
        • 2.Bf6#
      • 1...Bd6
        • 2.Bf6#
      • 1...Be7
        • 2.Bf4#
      • 1...Bg7
        • 2.Bf4#
      • 1...f4!
    • 1.Qc4?
      • threat
        • 2.Qh4#
      • 1...e4
        • 2.Bf4#
      • 1...f4!
    • 1.Qc6?
      • threat
        • 2.Qf6#
        • 2.Qg6#
      • 1...Be7
        • 2.Qg6#
        • 2.Qxh6#
      • 1...Bg7
        • 2.Qg6#
      • 1...Bd6!
    • 1.Qc8?
      • 1...Ba3
        • 2.Qg8#
      • 1...Bb4
        • 2.Qg8#
      • 1...Bc5
        • 2.Qg8#
      • 1...Bd6
        • 2.Qg8#
      • 1...Be7
        • 2.Qg8#
      • 1...e4
        • 2.Bf4#
      • 1...f4
        • 2.Qg4#
      • 1...Bg7!
  • Keys
    • 1.Qc7!
      • 1...f4
        • 2.Qxe5#
      • 1...Ba3
        • 2.Qg7#
      • 1...Bb4
        • 2.Qg7#
      • 1...Bc5
        • 2.Qg7#
      • 1...Bd6
        • 2.Qg7#
      • 1...Be7
        • 2.Qxe7#
      • 1...Bg7
        • 2.Qxg7#
      • 1...e4
        • 2.Qf4#

This anticipates 95363(1998)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATE::B(G)
  • Tries
    • Try
      • B(G);XP(a)
      • Threat
        • DUALS(2)
      • Vars
        • B(e);::B(G)
      • Refutation
        • P(b);
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • P(a);OGATE::B(G)
      • Refutation
        • P(b);
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(e);::QAR1(B)
      • Refutation
        • B(e);
    • Try
      • Q(B);
      • Vars
        • B(e);OGATE::QAR(B)
        • P(a);OGATE::B(G)
        • P(b);OGATE::QAR1(B)
      • Refutation
        • B(e);
  • Actual
    • Q(B);
    • Vars
      • P(b);OGATEB::QAR2(B),XP(a)
      • B(e);N_GUARD::QAR2(B)
      • B(e);N_GUARD::QAB(B),XB(e)
      • B(e);N_GUARD::QAR2(B),XB(e)
      • P(a);OGATE::QAB1(B)
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