MESON Chess Problem Database

Problem Display
PID: 227340 (2b5/1p1k1PP1/6pK/qN1P2Q1/N3p3/b7/5B2/8 w - - 0 1)

Shire, David J

US Problem Bulletin, 1986

2b5/1p1k1PP1/6pK/qN1P2Q1/N3p3/b7/5B2/8

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Sb6#
    • 1...Qd2
      • 2.Sb6#
    • 1...Qc3
      • 2.Sb6#
    • 1...Qb4
      • 2.Sb6#
    • 1...Qb6
      • 2.Sxb6#
    • 1...Qa8
      • 2.Sb6#
    • 1...Bc1
      • 2.Sc5#
    • 1...Bb2
      • 2.Sc5#
    • 1...Bc5
      • 2.Sxc5#
    • 1...Bf8
      • 2.gxf8S#
  • Tries
    • 1.Bc5?
      • threat
        • 2.Qe7#
      • 1...Bxc5
        • 2.Sxc5#
      • 1...Qd2
        • 2.Sb6#
      • 1...Qd8
        • 2.Qg4#
      • 1...Bc1!
    • 1.Bb6?
      • threat
        • 2.Qd8#
      • 1...Qxb6
        • 2.Sxb6#
      • 1...Bc1
        • 2.Sc5#
      • 1...Be7
        • 2.Qg4#
      • 1...Qd2!
    • 1.Qg4+?
      • 1...Ke7
        • 2.f8Q#
      • 1...Kd8!
    • 1.f8Q?
      • threat
        • 2.Qg4#
      • 1...Qxb5
        • 2.Qgd8#
        • 2.Qfd8#
      • 1...Qd2
        • 2.Sb6#
        • 2.Qd8#
      • 1...Qb6
        • 2.Sxb6#
      • 1...Qa6
        • 2.Qgd8#
        • 2.Qfd8#
      • 1...Bc1
        • 2.Sc5#
        • 2.Qe7#
        • 2.Qf7#
      • 1...Bxf8!
    • 1.g8Q?
      • threat
        • 2.Qe8#
      • 1...Qxb5
        • 2.Q5d8#
        • 2.Q8d8#
      • 1...Qd8
        • 2.Q5xd8#
        • 2.Q8xd8#
      • 1...Bf8+!
  • Keys
    • 1.Bh4!
      • threat
        • 2.Qg4#
      • 1...Qxb5
        • 2.Qd8#
      • 1...Be7
        • 2.Qxe7#
      • 1...Qd2
        • 2.Sb6#
      • 1...Qb6
        • 2.Sxb6#
      • 1...Qa6
        • 2.Qd8#
      • 1...Bc1
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(c);N_GUARD::S(B)
    • Q(c);N_GUARD,P_PINQ(E)::S(B)
    • Q(c);N_GUARD::S(B),XQ(c)
    • B(a);N_GUARD,P_PINQ(E)::S(B)
    • B(a);N_GUARD::S(B)
    • B(a);N_GUARD::S(B),XB(a)
    • B(a);OGATE,P_PINP(H)::PXB(a)=S
  • Tries
    • Try
      • B(A);
      • Threat
        • QAR1(E)
      • Vars
        • B(a);XB(A)::S(B),XB(a)
        • Q(c);N_GUARD,P_PINQ(E)::S(B)
        • Q(c);SBLOCK::QAB(E)
      • Refutation
        • B(a);P_PINQ(E)
    • Try
      • B(A);
      • Threat
        • QAR1(E)
      • Vars
        • Q(c);XB(A)::S(B),XQ(c)
        • B(a);N_GUARD,P_PINQ(E)::S(B)
        • B(a);SBLOCK::QAB(E)
      • Refutation
        • Q(c);P_PINQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • K(f);P-FLIGHT::P=Q
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • P(G);
      • Threat
        • QAB(E)
      • Vars
        • Q(c);N_GUARD::S(B),XQ(c)
      • Refutation
        • B(a);P_PINP(H),XQ(G)
    • Try
      • P(H);
      • Threat
        • QAB1(H)
      • Refutation
        • B(a);CHECK
  • Actual
    • B(A);
    • Threat
      • QAB(E)
    • Vars
      • Q(c);N_GUARD,XS(C)::QAR1(E)
      • B(a);N_GUARD::QAR1(E),XB(a)
      • Q(c);N_GUARD,P_PINQ(E)::S(B)
      • Q(c);N_GUARD::S(B),XQ(c)
      • Q(c);N_GUARD::QAR1(E)
      • B(a);N_GUARD,P_PINQ(E)::S(B)
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