MESON Chess Problem Database

Problem Display
PID: 438 (1nRnN3/1rP4K/2k3P1/Q7/1pB5/1b2N3/8/8 w - - 0 1)

Mansfield, Comins

The Observer, 1952

(First published on Sun Jan 27 1952)

1nRnN3/1rP4K/2k3P1/Q7/1pB5/1b2N3/8/8

#2

8 + 6

3550 Complete Mansfield/II 1997
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd7
      • 2.cxd8Q#
    • 1...Rb5
      • 2.Qxb5#
    • 1...Rb6
      • 2.Qd5#
    • 1...Ra7
      • 2.Qb5#
    • 1...Rxc7+
      • 2.Rxc7#
      • 2.Qxc7#
    • 1...Sd7
      • 2.cxd8S#
    • 1...Sf7
      • 2.cxb8S#
  • Tries
    • 1.Bd5+?
      • 1...Kd7
        • 2.cxd8Q#
      • 1...Bxd5!
    • 1.Rxd8?
      • threat
        • 2.Rd6#
      • 1...Rxc7+
        • 2.Qxc7#
      • 1...Rb5
        • 2.Qxb5#
        • 2.c8Q#
      • 1...Rb6
        • 2.Qd5#
        • 2.c8Q#
      • 1...Ra7
        • 2.Qb5#
      • 1...Sd7!
    • 1.Qc5+?
      • 1...Kd7
        • 2.Rxd8#
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Kxc5!
    • 1.Qa6+?
      • 1...Kc5
        • 2.Qd6#
      • 1...Kd7
        • 2.cxd8Q#
      • 1...Rb6
        • 2.cxb8S#
        • 2.cxd8Q#
        • 2.cxd8R#
      • 1...Sxa6!
  • Keys
    • 1.Sg4!
      • threat
        • 2.Se5#
      • 1...Rxc7+
        • 2.Rxc7#
        • 2.Qxc7#
      • 1...Kd7
        • 2.cxd8Q#
      • 1...Rb5
        • 2.Qxb5#
      • 1...Rb6
        • 2.Qd5#
      • 1...Ra7
        • 2.Qb5#
      • 1...Sd7
        • 2.cxd8S#
      • 1...Sf7
        • 2.cxb8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(c);N_PINP(E),S_FLIGHT::PXS(f)=Q
    • R(d);N_GUARD,N_PINP(E)::QAB1(C),XR(d)
    • R(d);N_PINP(E),SBLOCK::QAB1(C)
    • R(d);N_GUARD::QAB1(C)
    • S(e);N_PINP(E),SBLOCK::PXS(f)=S
    • S(f);N_PINP(E)::PXS(e)=S
  • Tries
    • Try
      • B(B);CHECK
      • Vars
        • K(c);N_PINP(E),S_FLIGHT::PXS(f)=Q
      • Refutation
        • B(a);XB(B)
    • Try
      • R(G);XS(f)
      • Threat
        • R1(G)
      • Vars
        • R(d);CHECK,OGATE,XP(E)::QAR1(C),XR(d)
        • R(d);N_GUARD::QAB1(C)
      • Refutation
        • S(e);N_PINP(E)
    • Try
      • Q(C);CHECK
      • Refutation
        • K(c);P-FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(c);OGATE,P-FLIGHT::QAB1(C)
        • K(c);N_PINP(E),S_FLIGHT::PXS(f)=Q
      • Refutation
        • S(e);XQ(C)
  • Actual
    • S(A);
    • Threat
      • S(A)
    • Vars
      • K(c);N_PINP(E),S_FLIGHT::PXS(f)=Q
      • R(d);N_GUARD,N_PINP(E)::QAB1(C),XR(d)
      • R(d);N_PINP(E),SBLOCK::QAB1(C)
      • R(d);N_GUARD::QAB1(C)
      • S(e);N_PINP(E),SBLOCK::PXS(f)=S
      • S(f);N_PINP(E)::PXS(e)=S
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