MESON Chess Problem Database

Problem Display
PID: 41415 (5R2/8/2K2np1/2P1bkp1/7r/1Q5n/2RB3N/1B6 w - - 0 1)

Mansfield, Comins

The Observer, 1943

(First published on Sun Oct 17 1943)

5R2/8/2K2np1/2P1bkp1/7r/1Q5n/2RB3N/1B6

#2

8 + 7

3550 Complete Mansfield/II 1997
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Rc4#
    • 1...Rh5
      • 2.Rc1#
      • 2.Ra2#
      • 2.Rb2#
      • 2.Rc3#
    • 1...Rh6
      • 2.Rc1#
      • 2.Ra2#
      • 2.Rb2#
      • 2.Rc3#
    • 1...Rh7
      • 2.Rc1#
      • 2.Ra2#
      • 2.Rb2#
      • 2.Rc3#
    • 1...Rh8
      • 2.Rc1#
      • 2.Ra2#
      • 2.Rb2#
      • 2.Rc3#
    • 1...g4
      • 2.Rc1#
      • 2.Ra2#
      • 2.Rb2#
      • 2.Rc3#
  • Tries
    • 1.Qe6+?
      • 1...Ke4
        • 2.Rc4#
      • 1...Kxe6!
    • 1.Qd3+?
      • 1...Re4
        • 2.Qd7#
      • 1...Ke6!
  • Keys
    • 1.Bf4!
      • threat
        • 2.Rf2#
      • 1...Ke4
        • 2.Rc4#
      • 1...Kxf4
        • 2.Qf3#
      • 1...Bxf4
        • 2.Re2#
      • 1...gxf4
        • 2.Rg2#
      • 1...Sf2
        • 2.Rxf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(d);N_SPINS(f),S_FLIGHT::B(A)+R(B),DCHECK
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • K(d);N_SPINS(f),P_SPINB(c),S_FLIGHT::B(A)+R(B),DCHECK
      • Refutation
        • K(d);N_SPINS(f),S_FLIGHT,XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • R(b);P_SPINR(b),SBLOCK::QAB(E)
      • Refutation
        • K(d);N_SPINS(f),S_FLIGHT
  • Actual
    • B(C);
    • Threat
      • B(A)+R(B)
    • Vars
      • K(d);N_SPINS(f),S_FLIGHT::B(A)+R(B),DCHECK
      • K(d);OGATEB,P-FLIGHT,XB(C)::QAR1(E)
      • B(c);SBLOCK,XB(C)::B(A)+R(B)
      • P(e);SBLOCK,XB(C)::B(A)+R(B)
      • S(a);::B(A)+R(B),XS(a)
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