MESON Chess Problem Database

Problem Display
PID: 116347 (1B4kN/1P4P1/8/1p6/1r4RR/1P5K/Q7/8 w - - 0 1)

Hermanson, Halvar

To Mat, 1963

1B4kN/1P4P1/8/1p6/1r4RR/1P5K/Q7/8

#2

9 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb3+
      • 2.Qxb3#
    • 1...Ra4
      • 2.bxa4#
  • Tries
    • 1.Qb1?
      • threat
        • 2.Qh7#
      • 1...Rxb3+
        • 2.Qxb3#
      • 1...Re4!
    • 1.Qc2?
      • threat
        • 2.Qh7#
        • 2.Qc8#
      • 1...Rxb3+
        • 2.Qxb3#
      • 1...Rxg4
        • 2.Qh7#
      • 1...Rc4
        • 2.Qh7#
      • 1...Rd4
        • 2.Qh7#
      • 1...Rf4
        • 2.Qh7#
      • 1...Re4!
    • 1.Qa3?
      • 1...Rxb3+
        • 2.Qxb3#
      • 1...Rxg4
        • 2.Qf8#
      • 1...Rc4
        • 2.Qf8#
      • 1...Ra4
        • 2.Qf8#
      • 1...Rd4
        • 2.Qf8#
      • 1...Re4
        • 2.Qf8#
      • 1...Rf4!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Bh2#
        • 2.Bg3#
        • 2.Bf4#
        • 2.Be5#
        • 2.Bd6#
        • 2.Ba7#
        • 2.Bc7#
      • 1...Rxb3+
        • 2.Bg3#
      • 1...Rxg4
        • 2.Be5#
      • 1...Rc4
        • 2.Bc7#
      • 1...Ra4
        • 2.Ba7#
      • 1...Rd4
        • 2.Bd6#
      • 1...Re4
        • 2.Be5#
      • 1...Rf4
        • 2.Bxf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • R(a);CHECK,OGATE,P_SPINR(a),XP(B)::QAB(A),XR(a)
    • R(a);OGATE::QAB(A)+P(B),XR(a)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • R(a);CHECK,OGATE,XP(B)::QAB(A),XR(a)
      • Refutation
        • R(a);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);CHECK,OGATE,XP(B)::QAB(A),XR(a)
        • R(a);XR(D)::QAB1(A)
        • R(a);::QAB1(A)
      • Refutation
        • R(a);
    • Try
      • Q(A);
      • Vars
        • R(a);CHECK,OGATE,XP(B)::QAB(A),XR(a)
        • R(a);OGATE,XR(D)::QAR1(A)
        • R(a);OGATE::QAR1(A)
      • Refutation
        • R(a);
  • Actual
    • Q(A);
    • Threat
      • DUALS(7)
    • Vars
      • R(a);CHECK,XP(B)::QAR(A)+B(H)
      • R(a);XR(D)::QAR(A)+B(H)
      • R(a);::QAR(A)+B(H)
      • R(a);::QAR(A)+B(H),XR(a)
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