MESON Chess Problem Database

Problem Display
PID: 70669 (8/8/8/7p/5K2/7k/2Q4p/3B3n w - - 0 1)

Valuska, Jan

Sp. Comm., Mat, 1974

8/8/8/7p/5K2/7k/2Q4p/3B3n

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Kh4
      • 2.Qxh2#
    • 1...h4
      • 2.Bg4#
  • Tries
    • 1.Bg4+?
      • 1...Kh4
        • 2.Qxh2#
      • 1...hxg4!
    • 1.Qf5+?
      • 1...Kh4
        • 2.Qxh5#
      • 1...Kg2!
    • 1.Qf2?
      • 1...Sg3
        • 2.Qxg3#
      • 1...h4
        • 2.Bg4#
        • 2.Qf1#
      • 1...Sxf2!
    • 1.Qg2+?
      • 1...Kh4
        • 2.Qxh2#
      • 1...Kxg2!
  • Keys
    • 1.Qg6!
      • 1...Kh4
        • 2.Qxh5#
      • 1...Sg3
        • 2.Qxg3#
      • 1...Sf2
        • 2.Qg3#
      • 1...h4
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(c);P-FLIGHT::QAR2(B),XP(b)
    • P(d);N_GUARD,SBLOCK::B(A)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR2(B),XP(b)
      • Refutation
        • P(d);XB(A)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(B),XP(d)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • S(a);N_GUARD::QAR1(B),XS(a)
      • Refutation
        • S(a);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR2(B),XP(b)
      • Refutation
        • K(c);S_FLIGHT,XQ(B)
  • Actual
    • Q(B);
    • Vars
      • K(c);P-FLIGHT::QAR1(B),XP(d)
      • S(a);N_GUARD::QAR1(B),XS(a)
      • S(a);N_GUARD::QAR1(B)
      • P(d);N_GUARD::QAB1(B)
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