MESON Chess Problem Database

Problem Display
PID: 146320 (K3B2Q/8/kN6/8/2n5/1R6/8/8 w - - 0 1)

Stojnic, Dragan

The Problemist, 2012

K3B2Q/8/kN6/8/2n5/1R6/8/8

#2

5 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Qa1#
    • 1...Se3
      • 2.Qa1#
    • 1...Sd6
      • 2.Qa1#
  • Tries
    • 1.Bb5+?
      • 1...Ka5
        • 2.Sxc4#
      • 1...Kxb6!
    • 1.Qa1+?
      • 1...Sa3
        • 2.Qxa3#
      • 1...Sa5!
    • 1.Qg7?
      • threat
        • 2.Qa7#
      • 1...Ka5
        • 2.Qa7#
      • 1...Sxb6+!
    • 1.Qh6?
      • threat
        • 2.Sxc4#
      • 1...Sxb6+
        • 2.Qxb6#
      • 1...Ka5
        • 2.Sxc4#
      • 1...Sb2
        • 2.Sc4#
      • 1...Sd2
        • 2.Sc4#
        • 2.Ra3#
      • 1...Sa3
        • 2.Sc4#
        • 2.Rxa3#
      • 1...Se3
        • 2.Sc4#
        • 2.Ra3#
      • 1...Sa5
        • 2.Bb5#
      • 1...Se5
        • 2.Ra3#
      • 1...Sd6!
    • 1.Qh7?
      • threat
        • 2.Qa7#
      • 1...Ka5
        • 2.Qa7#
      • 1...Sxb6+!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Sxc4#
      • 1...Sxb6+
        • 2.Qxb6#
      • 1...Ka5
        • 2.Sxc4#
      • 1...Sb2
        • 2.Sc4#
      • 1...Sd2
        • 2.Sc4#
        • 2.Ra3#
        • 2.Qa1#
      • 1...Sa3
        • 2.Sc4#
        • 2.Rxa3#
      • 1...Se3
        • 2.Sc4#
        • 2.Ra3#
        • 2.Qa1#
      • 1...Sa5
        • 2.Bb5#
      • 1...Se5
        • 2.Ra3#
      • 1...Sd6
        • 2.Qa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • S(a);N_GUARD::QAR(E)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • K(b);P-FLIGHT::S(B),XS(a)
      • Refutation
        • K(b);P-FLIGHT,XS(B)
    • Try
      • Q(E);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR(E),XS(a)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • K(b);P-FLIGHT::QAR2(E)
      • Refutation
        • S(a);CHECK,XS(B)
    • Try
      • Q(E);
      • Threat
        • QAR(E)+S(B),XS(a)
      • Vars
        • S(a);CHECK,OGATE,P_SPINS(a),XS(B)::QAR1(E),XS(a)
        • K(b);P-FLIGHT::S(B),XS(a)
        • S(a);::QAR(E)+S(B)
        • S(a);SBLOCK::B(D)
        • S(a);N_GUARD::R(A)
      • Refutation
        • S(a);
    • Try
      • Q(E);
      • Threat
        • QAR1(E)
      • Vars
        • K(b);P-FLIGHT::QAR2(E)
      • Refutation
        • S(a);CHECK,XS(B)
  • Actual
    • Q(E);
    • Threat
      • QAR(E)+S(B),XS(a)
    • Vars
      • S(a);CHECK,OGATE,P_SPINS(a),XS(B)::QAR1(E),XS(a)
      • K(b);P-FLIGHT::S(B),XS(a)
      • S(a);::QAR(E)+S(B)
      • S(a);SBLOCK::B(D)
      • S(a);N_GUARD::R(A)
      • S(a);N_GUARD::QAR(E)
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