MESON Chess Problem Database

Problem Display
PID: 2572 (4q1kr/2Q3Bn/7P/1p4NN/1P2B3/8/4K3/8 w - - 0 1)

Murphy, MJ

English Mechanic and World of Science, 1909

(First published on Fri Dec 17 1909)

4q1kr/2Q3Bn/7P/1p4NN/1P2B3/8/4K3/8

#2

8 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qc6
      • 2.Qf7#
    • 1...Qf7
      • 2.Qxf7#
    • 1...Qe5
      • 2.Qf7#
    • 1...Qa8
      • 2.Qf7#
    • 1...Qb8
      • 2.Bd5#
      • 2.Qf7#
    • 1...Qc8
      • 2.Qf7#
    • 1...Qd8
      • 2.Qf7#
    • 1...Sxg5
      • 2.Sf6#
    • 1...Sf6
      • 2.Sxf6#
    • 1...Sf8
      • 2.Sf6#
  • Tries
    • 1.Qd8?
      • 1...Sxg5
        • 2.Qxe8#
      • 1...Qf8
        • 2.Bd5#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sf8
        • 2.Sf6#
      • 1...Qxd8!
    • 1.Qc4+?
      • 1...Qf7
        • 2.Qxf7#
      • 1...Qe6
        • 2.Qxe6#
      • 1...bxc4!
    • 1.Qc8?
      • 1...Sxg5
        • 2.Qxe8#
      • 1...Qd8
        • 2.Bd5#
        • 2.Qe6#
      • 1...Qf8
        • 2.Bd5#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sf8
        • 2.Sf6#
      • 1...Qxc8!
  • Keys
    • 1.Qb8!
      • 1...Qxb8
        • 2.Bd5#
      • 1...Sxg5
        • 2.Qxe8#
      • 1...Qc8
        • 2.Bd5#
      • 1...Qd8
        • 2.Bd5#
      • 1...Qf8
        • 2.Bd5#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sf8
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_GUARD,N_PINB(C)::QAB1(G)
    • Q(c);N_GUARD,N_PINB(C)::QAB1(G),XQ(c)
    • Q(c);N_GUARD::QAB1(G)
    • S(b);N_GUARD,XS(D)::S(E)
    • S(b);N_GUARD::S(E),XS(b)
    • S(b);N_GUARD::S(E)
  • Tries
    • Try
      • Q(G);P_PINQ(c)
      • Vars
        • S(b);N_GUARD,XS(D)::QAR2(G),XQ(c)
        • Q(c);N_PINB(C)::B(C)
        • S(b);N_GUARD::S(E),XS(b)
        • S(b);N_GUARD,N_SPINQ(c)::S(E)
      • Refutation
        • Q(c);N_PINB(C),N_SPINQ(c),XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • Q(c);N_GUARD,N_PINB(C),P_SPINQ(c)::QAB1(G),XQ(c)
        • Q(c);N_GUARD,P_SPINQ(c)::QAB(G),XQ(c)
      • Refutation
        • P(a);XQ(G)
    • Try
      • Q(G);P_PINQ(c)
      • Vars
        • S(b);N_GUARD,XS(D)::QAR2(G),XQ(c)
        • Q(c);N_PINB(C)::B(C)
        • S(b);N_GUARD::S(E),XS(b)
        • S(b);N_GUARD,N_SPINQ(c)::S(E)
      • Refutation
        • Q(c);N_PINB(C),N_SPINQ(c),XQ(G)
  • Actual
    • Q(G);P_PINQ(c)
    • Vars
      • Q(c);N_PINB(C),N_SPINQ(c),XQ(G)::B(C)
      • S(b);N_GUARD,XS(D)::QAR2(G),XQ(c)
      • Q(c);N_PINB(C)::B(C)
      • S(b);N_GUARD::S(E),XS(b)
      • S(b);N_GUARD,N_SPINQ(c)::S(E)
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