MESON Chess Problem Database

Problem Display
PID: 443 (B4R2/5q1r/1n6/3NP2p/p2K2NB/Rb3kP1/5n2/5Qb1 w - - 0 1)

Mansfield, Comins

The Observer, 1953

(First published on Sun Jan 25 1953)

B4R2/5q1r/1n6/3NP2p/p2K2NB/Rb3kP1/5n2/5Qb1

#2

10 + 9

3550 Complete Mansfield/II 1997
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxg4
      • 2.Se3#
    • 1...Qf4+
      • 2.Rxf4#
    • 1...Bh2
      • 2.Sxh2#
    • 1...Sc4
      • 2.Sde3#
    • 1...hxg4
      • 2.Sxb6#
  • Tries
    • 1.Rxb3+?
      • 1...Kxg4
        • 2.Se3#
      • 1...axb3!
    • 1.Rxf7+?
      • 1...Kxg4
        • 2.Se3#
        • 2.Rf4#
      • 1...Rxf7!
    • 1.Qe2+?
      • 1...Kg2
        • 2.Sf4#
      • 1...Kxe2!
    • 1.Qd1+?
      • 1...Kg2
        • 2.Sf4#
      • 1...Sxd1+!
  • Keys
    • 1.e6!
      • threat
        • 2.Se5#
      • 1...Qf4+
        • 2.Rxf4#
      • 1...Kxg4
        • 2.Se3#
      • 1...hxg4
        • 2.Sxb6#
      • 1...Sc4
        • 2.Sde3#
      • 1...Sd7
        • 2.Sdf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(d);N_SPINB(c),N_SPINQ(h),N_SPINS(b),S_FLIGHT,XS(E)::S(G)
    • Q(h);CHECK,OGATE::R1(J),XQ(h)
    • B(a);N_GUARD::S(E),XB(a)
    • S(g);N_GUARD::B(I)+S(G)
    • P(f);SBLOCK,XS(E)::B(I)+S(G),XS(g)
  • Tries
    • Try
      • R(B);CHECK,XB(c)
      • Vars
        • K(d);N_SPINQ(h),N_SPINS(b),S_FLIGHT,XS(E)::S(G)
      • Refutation
        • P(e);XR(B)
    • Try
      • R(J);CHECK,XQ(h)
      • Refutation
        • R(i);XR(J)
    • Try
      • Q(A);CHECK,N_PINS(b)
      • Vars
        • K(d);N_SPINB(c),N_SPINQ(h),P_SPINS(b),S_FLIGHT::B(I)+S(G),DCHECK
      • Refutation
        • K(d);N_SPINB(c),N_SPINQ(h),S_FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK,N_PINS(b)
      • Vars
        • K(d);N_SPINB(c),N_SPINQ(h),S_FLIGHT::B(I)+S(G),DCHECK
      • Refutation
        • S(b);CHECK,XQ(A)
  • Actual
    • P(H);
    • Threat
      • S(E)
    • Vars
      • Q(h);CHECK,OGATE::R1(J),XQ(h)
      • K(d);N_SPINB(c),N_SPINQ(h),N_SPINS(b),S_FLIGHT,XS(E)::S(G)
      • P(f);SBLOCK,XS(E)::B(I)+S(G),XS(g)
      • S(g);N_GUARD::B(I)+S(G)
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