MESON Chess Problem Database

Problem Display
PID: 178708 (2bb1K1n/1pPkNp2/pP1P1Rp1/P5P1/1p1Q1p2/8/8/8 w - - 0 1)

Maleika, Gerhard

2nd HM., Problem Observer Block-Threat Ty., 2009-2010

2bb1K1n/1pPkNp2/pP1P1Rp1/P5P1/1p1Q1p2/8/8/8

#2

9 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Bxc7
      • 2.dxc7#
    • 1...Bxe7+
      • 2.dxe7#
    • 1...b3
      • 2.Qa4#
    • 1...f3
      • 2.Qg4#
  • Tries
    • 1.Qd3?
      • threat
        • 2.Qh3#
      • 1...Bxe7+
        • 2.dxe7#
      • 1...Bxc7
        • 2.dxc7#
      • 1...f3!
    • 1.Qc4?
      • 1...Bxc7
        • 2.Qxc7#
      • 1...b3
        • 2.Qa4#
      • 1...f3
        • 2.Qg4#
      • 1...Bxe7+!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Qa4#
        • 2.Qg4#
      • 1...Bxe7+
        • 2.dxe7#
      • 1...Bxc7
        • 2.dxc7#
      • 1...b3
        • 2.Qg4#
      • 1...f3
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • B(i);OGATE,XP(G)::QAR(A)+P(E),XB(i)
    • B(i);CHECK,OGATE,XS(H)::QAR(A)+P(E),XB(i)
    • P(a);OGATE::QAB(A)
    • P(b);OGATE::QAB(A)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • B(i);CHECK,OGATE,XS(H)::QAR(A)+P(E),XB(i)
        • B(i);OGATE,XP(G)::QAR(A)+P(E),XB(i)
      • Refutation
        • P(b);
    • Try
      • Q(A);
      • Vars
        • B(i);OGATE,XP(G)::QAR1(A),XB(i)
        • P(a);OGATE::QAB(A)
        • P(b);OGATE::QAB(A)
      • Refutation
        • B(i);CHECK,XS(H)
  • Actual
    • Q(A);
    • Threat
      • DUALS(2)
    • Vars
      • B(i);CHECK,OGATE,XS(H)::QAR(A)+P(E),XB(i)
      • B(i);OGATE,XP(G)::QAR(A)+P(E),XB(i)
      • P(a);::QAB(A)
      • P(b);::QAB(A)
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