MESON Chess Problem Database

Problem Display
PID: 231703 (8/1K6/1N2pp2/3P4/4k3/2P1p1P1/6P1/5Q2 w - - 0 1)

Anonymous

Pen & Pencil, 1888

(First published on Sat Dec 1 1888)

8/1K6/1N2pp2/3P4/4k3/2P1p1P1/6P1/5Q2

#2

7 + 4

15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Qf4#
    • 1...e5
      • 2.Qb1#
  • Tries
    • 1.Qd3+?
      • 1...Ke5
        • 2.Sc4#
      • 1...Kxd3!
    • 1.Qc4+?
      • 1...Ke5
        • 2.Qf4#
      • 1...Kf5!
    • 1.Qf3+?
      • 1...Ke5
        • 2.Sc4#
        • 2.Qf4#
      • 1...Kd3!
  • Keys
    • 1.Sd7!
      • 1...Kxd5
        • 2.Qd3#
      • 1...exd5
        • 2.Qb1#
      • 1...e2
        • 2.Qf3#
      • 1...e5
        • 2.Sxf6#
      • 1...f5
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(b);P-FLIGHT::QAB1(A)
    • P(c);SBLOCK::QAB(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::S(F)
      • Refutation
        • K(b);S_FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);P_SPINP(a),S_FLIGHT
  • Actual
    • S(F);
    • Vars
      • K(b);S_FLIGHT,XP(E)::QAR2(A)
      • P(c);SBLOCK,XP(E)::QAB(A)
      • P(a);::QAB1(A)
      • P(c);SBLOCK::S(F),XP(d)
      • P(d);SBLOCK::QAR2(A)
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