MESON Chess Problem Database

Problem Display
PID: 238749 (8/8/4K3/8/4kB2/2P1PR2/1N4np/6QB w - - 0 1)

Hermanson, Halvar

L'Italia Scacchistica, 1949

8/8/4K3/8/4kB2/2P1PR2/1N4np/6QB

#2

8 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf3
      • 2.Qxg2#
    • 1...Se1
      • 2.Qg6#
    • 1...Sxe3
      • 2.Qxe3#
    • 1...Sxf4+
      • 2.Rxf4#
    • 1...Sh4
      • 2.Qb1#
  • Tries
    • 1.Bxh2?
      • threat
        • 2.Rf4#
      • 1...Sf4+
        • 2.Rxf4#
      • 1...Kxf3!
    • 1.Qf2?
      • 1...Sxf4+
        • 2.Rxf4#
      • 1...Sxe3
        • 2.Rxe3#
        • 2.Qxe3#
      • 1...Sh4
        • 2.Qc2#
      • 1...Se1!
    • 1.Qd1?
      • threat
        • 2.Qd5#
      • 1...Sxe3
        • 2.Qd3#
        • 2.Qd4#
      • 1...Sxf4+!
    • 1.Qf1?
      • 1...Sxe3
        • 2.Rxe3#
        • 2.Qd3#
      • 1...Se1
        • 2.Qc4#
      • 1...Sh4
        • 2.Qd3#
        • 2.Qc4#
        • 2.Qb1#
      • 1...Sxf4+!
  • Keys
    • 1.Qxh2!
      • 1...Sxf4+
        • 2.Qxf4#
      • 1...Kxf3
        • 2.Qxg2#
      • 1...Sxe3
        • 2.Rxe3#
      • 1...Se1
        • 2.Qh7#
      • 1...Sh4
        • 2.Qc2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(c);OGATEB,P_SPINS(a),S_FLIGHT,XR(F)::QAB1(A),XS(a)
    • S(a);OGATE::QAB(A)
    • S(a);OGATE,XP(E)::QAR1(A),XS(a)
    • S(a);CHECK,OGATE,XB(G)::B(B)+R(F),DCHECK,XS(a)
    • S(a);::QAB(A)
  • Tries
    • Try
      • B(G);XP(b)
      • Threat
        • R1(F)
      • Vars
        • S(a);CHECK::B(B)+R(F),DCHECK,XS(a)
      • Refutation
        • K(c);P_SPINS(a),S_FLIGHT,XR(F)
    • Try
      • Q(A);
      • Vars
        • S(a);CHECK,OGATE,XB(G)::B(B)+R(F),DCHECK,XS(a)
        • S(a);::QAB(A)
      • Refutation
        • S(a);
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Refutation
        • S(a);CHECK,XB(G)
    • Try
      • Q(A);
      • Vars
        • S(a);::QAR2(A)
      • Refutation
        • S(a);CHECK,XB(G)
  • Actual
    • Q(A);XP(b)
    • Vars
      • S(a);CHECK,OGATE,XB(G)::QAR1(A),XS(a)
      • K(c);OGATEB,P_SPINS(a),S_FLIGHT,XR(F)::QAB1(A),XS(a)
      • S(a);OGATE,XP(E)::B(B)+R(F),DCHECK,XS(a)
      • S(a);::QAB(A)
      • S(a);OGATE::QAB(A)
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