MESON Chess Problem Database

Problem Display
PID: 200259 (5R2/B3Q3/8/1p1NP3/1Pb3p1/1p1p2pp/1P1K2kr/5N1q w - - 0 1)

Werle, Allan Theodor

The Problemist, 1982

5R2/B3Q3/8/1p1NP3/1Pb3p1/1p1p2pp/1P1K2kr/5N1q

#2

9 + 10

SOLUTION

  • SOUND
  • Tries
    • 1.Qc5?
      • 1...Bxd5
        • 2.Qxd5#
      • 1...Qg1
        • 2.Qxg1#
      • 1...Qxf1!
    • 1.Qf7?
      • 1...Qxf1
        • 2.Qxf1#
      • 1...Bxd5
        • 2.Qxd5#
      • 1...Qg1!
  • Keys
    • 1.Qb7!
      • 1...Qxf1
        • 2.Sf4#
      • 1...Bxd5
        • 2.Qxd5#
      • 1...Qg1
        • 2.Sde3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(H);
      • Vars
        • B(h);OGATE,XS(E)::QAB(H),XB(h)
        • Q(a);N_GUARD::QAR1(H),XQ(a)
      • Refutation
        • Q(a);XS(A)
    • Try
      • Q(H);
      • Vars
        • Q(a);OGATE,XS(A)::QAB1(H),XQ(a)
        • B(h);OGATE,XS(E)::QAB(H),XB(h)
      • Refutation
        • Q(a);
  • Actual
    • Q(H);
    • Vars
      • Q(a);SBLOCK,XS(A)::QAB(H)+S(E),DCHECK
      • B(h);OGATE,P_SPINB(h),XS(E)::QAB(H),XB(h)
      • Q(a);SBLOCK::QAB(H)+S(E),DCHECK
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