MESON Chess Problem Database

Problem Display
PID: 67040 (n4B2/1Qn5/1pP4p/3k2qR/4R1p1/6K1/8/7B w - - 0 1)

Markovtsy, Vassyl Yuriovich

Problem Observer, 2006

n4B2/1Qn5/1pP4p/3k2qR/4R1p1/6K1/8/7B

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5+
      • 2.Rhxe5#
    • 1...Qf5
      • 2.Rxf5#
    • 1...Sb5
      • 2.c7#
    • 1...Sa6
      • 2.Qd7#
      • 2.c7#
    • 1...Se6
      • 2.Qd7#
      • 2.c7#
    • 1...Se8
      • 2.c7#
  • Tries
    • 1.Qxc7?
      • threat
        • 2.Qd6#
        • 2.Qd7#
      • 1...Qe5+
        • 2.Rhxe5#
      • 1...Sxc7!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Qd7#
      • 1...Qe5+
        • 2.Rf4#
      • 1...Kxc6
        • 2.Re5#
      • 1...Sb5
        • 2.Qe6#
      • 1...Se8
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • Q(c);CHECK,OGATE::R1(D),XQ(c)
    • Q(c);OGATE::R(D),XQ(c)
    • S(f);OGATE::QAB(F)+P(E)
  • Tries
    • Try
      • Q(F);XS(f)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK,OGATE::R1(D),XQ(c)
      • Refutation
        • S(g);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • QAR2(F)
    • Vars
      • Q(c);CHECK::B(A)+R(C)
      • K(b);N_SPINQ(c),P_SPINS(f),S_FLIGHT,XP(E)::B(A)+R(C)
      • S(f);N_GUARD::QAB1(F)
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