MESON Chess Problem Database

Problem Display
PID: 424 (7Q/2q3n1/2pprbRN/R1n1k3/2P5/4PK1B/8/8 w - - 0 1)

Mansfield, Comins

The Observer, 1947

(First published on Sun Feb 16 1947)

7Q/2q3n1/2pprbRN/R1n1k3/2P5/4PK1B/8/8

#2

8 + 8

3550 Complete Mansfield/II 1997
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa5
      • 2.Sf7#
    • 1...Qb6
      • 2.Sf7#
    • 1...Qb8
      • 2.Sf7#
    • 1...Qd8
      • 2.Sf7#
    • 1...Qf7
      • 2.Sxf7#
    • 1...Qc8
      • 2.Sf7#
    • 1...Bh4
      • 2.Rxe6#
    • 1...Bg5
      • 2.Rxe6#
    • 1...Be7
      • 2.Sf7#
      • 2.Rxe6#
    • 1...Bd8
      • 2.Rxe6#
    • 1...Sf5
      • 2.Sg4#
    • 1...Sh5
      • 2.Rg5#
    • 1...Se8
      • 2.Rg5#
  • Tries
    • 1.Rg5+?
      • 1...Sf5
        • 2.Sg4#
        • 2.Rxf5#
      • 1...Bxg5!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Qb2#
      • 1...Qxa5
        • 2.Sf7#
      • 1...Qxb8
        • 2.Sf7#
      • 1...d5
        • 2.Sf7#
      • 1...Qb6
        • 2.Sf7#
      • 1...Qb7
        • 2.Rxc5#
      • 1...Sf5
        • 2.Sg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • Q(g);N_GUARD,N_SPINS(a),XR(E)::S(G)
    • Q(g);N_GUARD::S(G)
    • Q(g);N_GUARD::S(G),XQ(g)
    • B(f);OGATE::R1(F),XR(e)
    • S(h);P_SPINB(f),SBLOCK::S(G)
    • S(h);N_GUARD,P_SPINB(f)::R(F)
  • Tries
    • Try
      • R(F);CHECK
      • Refutation
        • B(f);XR(F)
  • Actual
    • Q(H);
    • Threat
      • QAB(H)
    • Vars
      • Q(g);N_GUARD,N_SPINS(a),P_SPINP(d),XR(E)::S(G)
      • Q(g);N_GUARD,XQ(H)::S(G)
      • P(d);N_SPINS(a),P_SPINQ(g)::S(G)
      • Q(g);N_GUARD,P_SPINP(d)::S(G)
      • Q(g);P_SPINP(d)::R(E),XS(a)
      • S(h);SBLOCK::S(G)
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