MESON Chess Problem Database

Problem Display
PID: 171025 (k2K4/P7/3N4/3b4/Q3P3/8/8/8 w - - 0 1)

Forsberg, Henry Olof Axel

Alt for Alla, 1932

k2K4/P7/3N4/3b4/Q3P3/8/8/8

#2

5 + 2

145 StrateGems 2017

SOLUTION

  • SOUND
  • Tries
    • 1.Qb5?
      • threat
        • 2.Qb8#
      • 1...Bb7
        • 2.Qxb7#
      • 1...Kxa7!
    • 1.Qb4?
      • threat
        • 2.Qb8#
      • 1...Bb7
        • 2.Qxb7#
      • 1...Kxa7!
  • Keys
    • 1.Sc8!
      • 1...Kb7
        • 2.a8Q#
      • 1...Bxe4
        • 2.Qxe4#
      • 1...Ba2
        • 2.Qc6#
      • 1...Bb3
        • 2.Qc6#
      • 1...Bc4
        • 2.Qc6#
      • 1...Bc6
        • 2.Qxc6#
      • 1...Be6
        • 2.Qc6#
      • 1...Bb7
        • 2.Sb6#
      • 1...Bf7
        • 2.Qc6#
      • 1...Bg8
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • B(a);N_GUARD::QAB1(A),XB(a)
      • Refutation
        • K(b);P-FLIGHT,XP(D)
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • B(a);N_GUARD::QAB1(A),XB(a)
      • Refutation
        • K(b);P-FLIGHT,XP(D)
  • Actual
    • S(C);
    • Vars
      • K(b);OGATE,S_FLIGHT::P=Q
      • B(a);OGATE,XP(B)::QAB(A),XB(a)
      • B(a);N_GUARD::QAB(A)
      • B(a);N_GUARD::QAB(A),XB(a)
      • B(a);SBLOCK::S(C)
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