MESON Chess Problem Database

Problem Display
PID: 423 (BB3n1q/3p1R1b/K1N2rp1/2N5/8/5k1P/2PQ4/8 w - - 0 1)

Mansfield, Comins

The Observer, 1947

(First published on Sun Nov 9 1947)

BB3n1q/3p1R1b/K1N2rp1/2N5/8/5k1P/2PQ4/8

#2

9 + 7

3550 Complete Mansfield/II 1997
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qg8
      • 2.Rxf6#
    • 1...Rf5
      • 2.Sd4#
    • 1...Rxf7
      • 2.Sd4#
    • 1...Se6
      • 2.Sd4#
    • 1...dxc6
      • 2.Bxc6#
  • Tries
    • 1.Bd6?
      • threat
        • 2.Sb4#
        • 2.Sd4#
        • 2.Sa5#
        • 2.Sa7#
        • 2.Se7#
        • 2.Sb8#
        • 2.Sd8#
      • 1...dxc6
        • 2.Bxc6#
      • 1...Se6
        • 2.Sd4#
        • 2.Sb8#
        • 2.Sd8#
      • 1...g5
        • 2.Sd4#
      • 1...Rf4!
  • Keys
    • 1.Se4!
      • threat
        • 2.Sg5#
      • 1...Kxe4
        • 2.Qd3#
      • 1...Rf4
        • 2.Rxf4#
      • 1...Se6
        • 2.Se5#
      • 1...g5
        • 2.Sxg5#
      • 1...d6
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • Q(g);N_GUARD::R(G),XR(b)
    • R(b);N_PINS(F)::B(H)+S(F),DCHECK
    • R(b);N_PINS(F),N_SPINR(b),XR(G)::B(H)+S(F),DCHECK
    • S(f);N_PINS(F)::B(H)+S(F),DCHECK
    • P(d);OGATE,P_SPINP(d),XS(F)::B(H),XP(d)
  • Tries
    • Try
      • B(I);N_SPINS(F)
      • Threat
        • DUALS(7)
      • Vars
        • P(d);OGATE,P_SPINP(d),XS(F)::B(H),XP(d)
        • P(c);::B(H)+S(F),DCHECK
      • Refutation
        • R(b);
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • K(a);N_SPINR(b),S_FLIGHT,XS(D)::QAB1(B)
      • R(b);N_PINS(F),OGATE::R1(G),XR(b)
      • S(f);N_PINS(F)::S(F)
      • P(c);::S(D),XP(c)
      • P(d);N_PINS(F)::S(F)
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