MESON Chess Problem Database

Problem Display
PID: 439 (K4RN1/Rnpk4/b2b2p1/1r1Q2p1/B1N3n1/8/8/8 w - - 0 1)

Mansfield, Comins

The Observer, 1952

(First published on Sun May 11 1952)

K4RN1/Rnpk4/b2b2p1/1r1Q2p1/B1N3n1/8/8/8

#2

7 + 9

3550 Complete Mansfield/II 1997
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Se5#
    • 1...Sh2
      • 2.Se5#
    • 1...Se3
      • 2.Se5#
    • 1...Se5
      • 2.Sxe5#
    • 1...Sf6
      • 2.Se5#
    • 1...Sh6
      • 2.Se5#
    • 1...Sa5
      • 2.Sb6#
      • 2.Qxd6#
    • 1...Sc5
      • 2.Sb6#
      • 2.Qxd6#
    • 1...Sd8
      • 2.Sb6#
    • 1...c5
      • 2.Qxd6#
    • 1...c6
      • 2.Qxd6#
  • Tries
    • 1.Sf6+?
      • 1...Ke7
        • 2.Qf7#
      • 1...Sxf6!
    • 1.Bxb5+?
      • 1...c6
        • 2.Qxd6#
      • 1...Bxb5!
    • 1.Rb8?
      • 1...c5
        • 2.Qxd6#
      • 1...c6
        • 2.Qxd6#
      • 1...Sf2
        • 2.Se5#
      • 1...Sh2
        • 2.Se5#
      • 1...Se3
        • 2.Se5#
      • 1...Se5
        • 2.Sxe5#
      • 1...Sf6
        • 2.Se5#
      • 1...Sh6
        • 2.Se5#
      • 1...Sa5
        • 2.Sb6#
        • 2.Qxd6#
      • 1...Sc5
        • 2.Sb6#
        • 2.Qxd6#
      • 1...Sd8!
    • 1.Qf5+?
      • 1...Kc6
        • 2.Rxa6#
      • 1...gxf5!
  • Keys
    • 1.Kb8!
      • 1...Sa5+
        • 2.Sb6#
      • 1...Sc5+
        • 2.Sb6#
      • 1...Sd8+
        • 2.Sb6#
      • 1...c5+
        • 2.Qxd6#
      • 1...c6+
        • 2.Qxd6#
      • 1...Sf2
        • 2.Se5#
      • 1...Sh2
        • 2.Se5#
      • 1...Se3
        • 2.Se5#
      • 1...Se5
        • 2.Sxe5#
      • 1...Sf6
        • 2.Se5#
      • 1...Sh6
        • 2.Se5#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::S(B)
    • S(a);N_GUARD::S(B),XS(a)
    • S(g);P_SPINP(h)::S(B)
    • P(h);N_GUARD,P_SPINS(g)::QAR1(C),XB(e)
    • P(h);N_GUARD,N_SPINR(b),P_SPINS(g)::QAR1(C),XB(e)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(i);N_SPINB(e),N_SPINR(b),P-FLIGHT::QAR1(C)
      • Refutation
        • S(a);XS(G)
    • Try
      • B(A);CHECK,XR(b)
      • Vars
        • P(h);P_SPINP(h),P_SPINS(g)::QAR1(C),XB(e)
      • Refutation
        • B(d);XB(A)
    • Try
      • R(F);
      • Vars
        • P(h);N_GUARD,P_SPINS(g)::QAR1(C),XB(e)
        • P(h);N_GUARD,N_SPINR(b),P_SPINS(g)::QAR1(C),XB(e)
        • S(a);N_GUARD::S(B)
        • S(a);N_GUARD::S(B),XS(a)
      • Refutation
        • S(g);P_SPINP(h)
    • Try
      • Q(C);CHECK,N_PINB(e)
      • Vars
        • K(i);S_FLIGHT::R(D),XB(d)
      • Refutation
        • P(f);XQ(C)
  • Actual
    • K(E);P-FLIGHT
    • Vars
      • S(g);CHECK,P_SPINP(h)::S(B)
      • P(h);CHECK,N_GUARD,P_SPINS(g)::QAR1(C),XB(e)
      • P(h);CHECK,N_GUARD,N_SPINR(b),P_SPINS(g)::QAR1(C),XB(e)
      • S(a);N_GUARD::S(B)
      • S(a);N_GUARD::S(B),XS(a)
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