MESON Chess Problem Database

Problem Display
PID: 2300 (4Q3/8/3bN3/r1n2p2/4kN2/6P1/2P2K2/1B6 w - - 0 1)

Derrickson, George H

Source?, 0000

4Q3/8/3bN3/r1n2p2/4kN2/6P1/2P2K2/1B6

#2

7 + 5

1679 American Chess Nuts 1868

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Qc6#
  • Tries
    • 1.c3+?
      • 1...Ke5
        • 2.Qh8#
      • 1...Sd3+!
    • 1.c4+?
      • 1...Ke5
        • 2.Qh8#
      • 1...Sd3+!
  • Keys
    • 1.Qh8!
      • threat
        • 2.Sg5#
        • 2.Qd4#
      • 1...Sd3+
        • 2.cxd3#
      • 1...Bxf4
        • 2.Qd4#
      • 1...Sxe6
        • 2.c3#
        • 2.c4#
      • 1...Be5
        • 2.Qh1#
      • 1...Ra4
        • 2.Sg5#
      • 1...Be7
        • 2.Qd4#
      • 1...Sb3
        • 2.Sg5#
        • 2.cxb3#
        • 2.c3#
        • 2.c4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(e);SBLOCK::QAB(G)
  • Tries
    • Try
      • P(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB(G)
      • Refutation
        • S(c);CHECK,P_SPINS(c)
    • Try
      • P(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB(G)
      • Refutation
        • S(c);CHECK,P_SPINS(c)
  • Actual
    • Q(G);
    • Threat
      • DUALS(2)
    • Vars
      • S(c);CHECK,OGATE::P(B),XS(c)
      • B(e);XS(E)::QAR1(G)
      • B(e);SBLOCK::QAB(G)
      • R(b);::S(F)
      • B(e);::QAR1(G)
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