MESON Chess Problem Database

Problem Display
PID: 139812 (5q2/1B6/6Q1/2p1k3/2P5/1K1R4/5b2/4N3 w - - 0 1)

Chapman, CF

The Problemist, 1937

5q2/1B6/6Q1/2p1k3/2P5/1K1R4/5b2/4N3

#2

6 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Rd5#
    • 1...Qf5
      • 2.Qd6#
    • 1...Qf6
      • 2.Qe4#
  • Tries
    • 1.Sf3+?
      • 1...Kf4
        • 2.Qg5#
      • 1...Qxf3!
    • 1.Re3+?
      • 1...Kd4
        • 2.Sc2#
        • 2.Re4#
        • 2.Qd3#
        • 2.Qe4#
      • 1...Kf4
        • 2.Sg2#
        • 2.Re4#
      • 1...Bxe3!
  • Keys
    • 1.Rd4!
      • threat
        • 2.Re4#
      • 1...Qf3+
        • 2.Sxf3#
      • 1...Kxd4
        • 2.Qe4#
      • 1...Bxd4
        • 2.Sd3#
      • 1...cxd4
        • 2.Sd3#
      • 1...Qf6
        • 2.Qe4#
      • 1...Qf4
        • 2.Rd5#
      • 1...Qf5
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(d);SBLOCK::R1(C)
    • Q(d);N_GUARD,SBLOCK::QAB1(E)
    • Q(d);SBLOCK::QAR1(E)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB1(E)
      • Refutation
        • Q(d);P_PINR(C),XS(A)
    • Try
      • R(C);CHECK
      • Refutation
        • B(a);XR(C)
  • Actual
    • R(C);
    • Threat
      • R1(C)
    • Vars
      • Q(d);CHECK,N_GUARD::S(A),XQ(d)
      • K(c);S_FLIGHT,XR(C)::QAR1(E)
      • B(a);SBLOCK,XR(C)::S(A)
      • P(b);SBLOCK,XR(C)::S(A)
      • Q(d);SBLOCK::QAR1(E)
      • Q(d);SBLOCK::R1(C)
      • Q(d);N_GUARD,SBLOCK::QAB1(E)
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