MESON Chess Problem Database

Problem Display
PID: 496 (3R2B1/8/8/5K1Q/p7/B3pp2/1nk5/1N1R4 w - - 0 1)

Heilbut, Zvi

The Observer, 1957

3R2B1/8/8/5K1Q/p7/B3pp2/1nk5/1N1R4

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...e2
      • 2.R8d2#
    • 1...f2
      • 2.Qe2#
  • Tries
    • 1.Qxf3?
      • threat
        • 2.Qe2#
      • 1...Sxd1
        • 2.Qxd1#
        • 2.Qe4#
      • 1...e2
        • 2.R8d2#
        • 2.Qxe2#
        • 2.Qc3#
      • 1...Sc4!
    • 1.Qe8?
      • 1...Sxd1
        • 2.Qe4#
      • 1...Sd3
        • 2.Qxa4#
      • 1...Sc4
        • 2.Qxa4#
      • 1...e2
        • 2.R8d2#
      • 1...f2!
    • 1.Qh2+?
      • 1...e2
        • 2.R8d2#
      • 1...f2!
    • 1.Qh4?
      • 1...Sxd1
        • 2.Qe4#
      • 1...Sd3
        • 2.Qxa4#
      • 1...Sc4
        • 2.Qxc4#
      • 1...e2
        • 2.R8d2#
      • 1...f2!
  • Keys
    • 1.Qg4!
      • 1...Sxd1
        • 2.Qe4#
      • 1...Sd3
        • 2.Qxa4#
      • 1...Sc4
        • 2.Qxc4#
      • 1...e2
        • 2.R8d2#
      • 1...f2
        • 2.Qe2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(c);N_GUARD::R1(F)
    • P(d);OGATE::QAR2(E)
  • Tries
    • Try
      • Q(E);XP(d)
      • Threat
        • QAR2(E)
      • Refutation
        • S(a);
    • Try
      • Q(E);
      • Vars
        • S(a);N_GUARD,XR(B)::QAB(E)
        • S(a);N_GUARD::QAB(E),XP(e)
        • P(c);N_GUARD::R1(F)
      • Refutation
        • P(d);
    • Try
      • Q(E);CHECK
      • Vars
        • P(c);N_GUARD,P_SPINP(c)::R1(F)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • Q(E);
      • Vars
        • S(a);N_GUARD,XR(B)::QAB(E)
        • S(a);N_GUARD::QAB(E),XP(e)
        • S(a);N_GUARD::QAR2(E),XS(a)
        • P(c);N_GUARD::R1(F)
      • Refutation
        • P(d);
  • Actual
    • Q(E);
    • Vars
      • S(a);N_GUARD,XR(B)::QAB(E)
      • S(a);N_GUARD::QAB(E),XP(e)
      • S(a);N_GUARD::QAR2(E),XS(a)
      • P(c);N_GUARD::R1(F)
      • P(d);OGATE::QAR2(E)
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