MESON Chess Problem Database

Problem Display
PID: 145268 (4K3/2P1P3/8/8/1R2NqNR/2P2k1P/Q2P3P/5B2 w - - 0 1)

Morse, Christopher Jeremy

White, James R

Problem Observer, 1990

4K3/2P1P3/8/8/1R2NqNR/2P2k1P/Q2P3P/5B2

#2

13 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd2
      • 2.Sxd2#
    • 1...Qxh2
      • 2.Sxh2#
    • 1...Qe3
      • 2.Se5#
    • 1...Qg3
      • 2.Sg5#
    • 1...Qe5
      • 2.Sxe5#
    • 1...Qg5
      • 2.Sxg5#
    • 1...Qd6
      • 2.Sg5#
    • 1...Qh6
      • 2.Se5#
    • 1...Qxc7
      • 2.Sg5#
    • 1...Qf7+
      • 2.Qxf7#
    • 1...Qf8+
      • 2.exf8Q#
      • 2.exf8R#
  • Tries
    • 1.Qd5?
      • threat
        • 2.Sg5#
      • 1...Qf7+
        • 2.Qxf7#
      • 1...Qf8+
        • 2.exf8Q#
        • 2.exf8R#
      • 1...Qxh2
        • 2.Sxh2#
      • 1...Qxe4
        • 2.Qxe4#
      • 1...Qg5
        • 2.Sxg5#
      • 1...Qxg4!
    • 1.Qa7?
      • threat
        • 2.Qf2#
      • 1...Qf8+
        • 2.exf8Q#
        • 2.exf8R#
      • 1...Qxd2
        • 2.Sxd2#
        • 2.Se5#
      • 1...Qxh2
        • 2.Sxh2#
        • 2.Qe3#
      • 1...Qe3
        • 2.Se5#
        • 2.Qxe3#
      • 1...Qg3
        • 2.Sg5#
        • 2.Qe3#
      • 1...Qf7+!
    • 1.d3?
      • threat
        • 2.Bg2#
        • 2.Qe2#
        • 2.Qf2#
        • 2.Qg2#
      • 1...Qf7+
        • 2.Qxf7#
      • 1...Qf8+
        • 2.exf8Q#
        • 2.exf8R#
      • 1...Qxc7
        • 2.Sd2#
        • 2.Sg5#
        • 2.Qf2#
      • 1...Qxe4
        • 2.Qf2#
      • 1...Qxg4
        • 2.Qf2#
      • 1...Qc1
        • 2.Qf2#
      • 1...Qd2
        • 2.Sxd2#
      • 1...Qe3
        • 2.Se5#
      • 1...Qg3
        • 2.Sd2#
        • 2.Sg5#
      • 1...Qe5
        • 2.Sd2#
        • 2.Qf2#
      • 1...Qg5
        • 2.Sxg5#
        • 2.Qf2#
      • 1...Qd6
        • 2.Sd2#
        • 2.Sg5#
        • 2.Qf2#
      • 1...Qh6
        • 2.Qf2#
      • 1...Qf5
        • 2.Sd2#
        • 2.Qf2#
      • 1...Qf6
        • 2.Sd2#
        • 2.Qf2#
      • 1...Qxh2!
  • Keys
    • 1.Qe6!
      • 1...Qf7+
        • 2.Qxf7#
      • 1...Qf8+
        • 2.exf8Q#
        • 2.exf8R#
      • 1...Qxd2
        • 2.Sxd2#
      • 1...Qxh2
        • 2.Sxh2#
      • 1...Qxc7
        • 2.Sg5#
      • 1...Qxe4
        • 2.Qxe4#
      • 1...Qxg4
        • 2.Qxg4#
      • 1...Qe3
        • 2.Se5#
      • 1...Qg3
        • 2.Sg5#
      • 1...Qe5
        • 2.Sxe5#
      • 1...Qg5
        • 2.Sxg5#
      • 1...Qd6
        • 2.Sg5#
      • 1...Qh6
        • 2.Se5#
      • 1...Qf5
        • 2.Qxf5#
      • 1...Qf6
        • 2.Qxf6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(b);XP(C)::S(H),XQ(b)
    • Q(b);XP(D)::S(I),XQ(b)
    • Q(b);N_GUARD::S(I)
    • Q(b);N_GUARD::S(H)
    • Q(b);N_GUARD,P_PINP(L)::S(I),XQ(b)
    • Q(b);N_GUARD::S(H),XQ(b)
    • Q(b);N_GUARD,XP(K)::S(H)
    • Q(b);CHECK,OGATEB::QAR(B),XQ(b)
    • Q(b);CHECK,OGATE::PXQ(b)=Q
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB(B)+S(H),DCHECK
      • Vars
        • Q(b);CHECK,OGATEB::QAR(B),XQ(b)
        • Q(b);CHECK,OGATE::PXQ(b)=Q
        • Q(b);XP(D)::S(I),XQ(b)
        • Q(b);OGATE,P_PINP(L),P_SPINQ(b),XS(H)::QAB1(B),XQ(b)
        • Q(b);::QAB(B)+S(H),DCHECK,XQ(b)
      • Refutation
        • Q(b);XS(I)
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • Q(b);CHECK,OGATE::PXQ(b)=Q
      • Refutation
        • Q(b);CHECK
    • Try
      • P(C);
      • Threat
        • DUALS(4)
      • Vars
        • Q(b);CHECK,OGATEB::QAR(B),XQ(b)
        • Q(b);CHECK,OGATE::PXQ(b)=Q
        • Q(b);P_PINP(L),XS(H)::QAR1(B)
        • Q(b);XS(I)::QAR1(B)
        • Q(b);::QAR1(B)
        • Q(b);N_GUARD::S(H),XQ(b)
        • Q(b);N_GUARD,SBLOCK::S(I)
      • Refutation
        • Q(b);XP(D)
  • Actual
    • Q(B);
    • Vars
      • Q(b);CHECK,OGATEB::QAR(B),XQ(b)
      • Q(b);CHECK,OGATE::PXQ(b)=Q
      • Q(b);XP(C)::S(H),XQ(b)
      • Q(b);XP(D)::S(I),XQ(b)
      • Q(b);N_GUARD,XP(K)::S(H)
      • Q(b);OGATE,XS(H)::QAB1(B),XQ(b)
      • Q(b);OGATE,XS(I)::QAB1(B),XQ(b)
      • Q(b);N_GUARD::S(I)
      • Q(b);N_GUARD::S(H)
      • Q(b);N_GUARD::S(I),XQ(b)
      • Q(b);N_GUARD::S(H),XQ(b)
      • Q(b);OGATEB::QAR2(B),XQ(b)
      • Q(b);OGATEB::QAR(B),XQ(b)
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