MESON Chess Problem Database

Problem Display
PID: 144902 (8/4p3/2QpkpP1/3Rqr2/NKN1nr2/1Bp1R3/8/8 w - - 0 1)

Holladay, Edgar Dinwiddie

StrateGems, 1999

8/4p3/2QpkpP1/3Rqr2/NKN1nr2/1Bp1R3/8/8

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5
      • 2.Qc8#
    • 1...Sd2
      • 2.Sc5#
    • 1...Sf2
      • 2.Sc5#
    • 1...Sg3
      • 2.Sc5#
    • 1...Sc5
      • 2.Sxc5#
    • 1...Sg5
      • 2.Sc5#
  • Tries
    • 1.Red3?
      • threat
        • 2.Qc8#
      • 1...Sc5
        • 2.Sxc5#
      • 1...Qd4!
    • 1.Rc5?
      • threat
        • 2.Sxe5#
        • 2.Qc8#
      • 1...Sxc5
        • 2.Sxc5#
      • 1...Rg5
        • 2.Qc8#
      • 1...Rh5
        • 2.Qc8#
      • 1...Qd4
        • 2.Qc8#
      • 1...Qd5
        • 2.Qc8#
      • 1...Sd2
        • 2.Qc8#
      • 1...Sf2
        • 2.Qc8#
      • 1...Sg3
        • 2.Qc8#
      • 1...Sg5
        • 2.Qc8#
      • 1...Qxc5+!
  • Keys
    • 1.Sxd6!
      • threat
        • 2.Qc8#
      • 1...Qd4+
        • 2.Sc4#
      • 1...Qxd6+
        • 2.Sc5#
      • 1...Sd2+
        • 2.Sc4#
      • 1...Sf2+
        • 2.Sc4#
        • 2.Rd4#
      • 1...Sg3+
        • 2.Sc4#
        • 2.Rd4#
      • 1...Sc5+
        • 2.Sc4#
      • 1...Sg5+
        • 2.Sc4#
        • 2.Rd4#
      • 1...Sxd6+
        • 2.Rd4#
      • 1...Qxd5
        • 2.Sf7#
      • 1...exd6
        • 2.Qe8#

This is a version of 21943

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(d);P_SPINS(b),SBLOCK,XR(F)::QAB(G)
    • S(b);N_GUARD,P_PINS(E),P_SPINQ(d)::S(C)
    • S(b);N_GUARD,P_PINS(E),P_SPINQ(d)::S(C),XS(b)
  • Tries
    • Try
      • R(B);
      • Threat
        • QAB(G)
      • Vars
        • S(b);N_GUARD,P_PINS(E)::S(C),XS(b)
      • Refutation
        • Q(d);P_PINS(E)
    • Try
      • R(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);P_PINS(E),P_SPINQ(d),XR(F)::S(C),XS(b)
        • R(e);::QAB(G)
        • Q(d);P_PINS(E),P_SPINS(b)::QAB(G)
        • Q(d);P_SPINS(b)::QAB(G)
        • S(b);P_PINS(E),P_SPINQ(d)::QAB(G)
      • Refutation
        • Q(d);CHECK,P_SPINS(b),XR(F)
  • Actual
    • S(E);XP(f)
    • Threat
      • QAB(G)
    • Vars
      • Q(d);CHECK,N_GUARD,P_SPINS(b)::QAR(G)+S(E)
      • Q(d);CHECK,P_SPINQ(d),P_SPINS(b),XS(E)::S(C)
      • S(b);CHECK,N_GUARD,P_SPINQ(d)::QAR(G)+S(E)
      • S(b);CHECK,P_SPINQ(d),P_SPINS(b),XS(E)::B(A)+R(F)
      • Q(d);N_GUARD,P_SPINQ(d),P_SPINS(b),XR(F)::QAR(G)+S(E)
      • P(i);OGATEB,P_SPINP(i),XS(E)::QAR2(G)
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