MESON Chess Problem Database

Problem Display
PID: 433 (2K5/8/1p6/B2Q4/k1Nb2R1/N2R4/1rq5/2rB4 w - - 0 1)

Mansfield, Comins

The Observer, 1949

(First published on Sun May 22 1949)

2K5/8/1p6/B2Q4/k1Nb2R1/N2R4/1rq5/2rB4

#2

8 + 6

3550 Complete Mansfield/II 1997
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb3
      • 2.Qb5#
    • 1...Ra2
      • 2.Qb5#
    • 1...Rb5
      • 2.Qxb5#
    • 1...bxa5
      • 2.Qxa5#
  • Tries
    • 1.Bxc2+?
      • 1...Rbxc2
        • 2.Qb5#
      • 1...Rb3
        • 2.Bxb3#
        • 2.Qb5#
      • 1...Rcxc2!
    • 1.Qc6+?
      • 1...Rb5
        • 2.Qxb5#
      • 1...b5!
    • 1.Qd7+?
      • 1...Rb5
        • 2.Qxb5#
      • 1...b5!
  • Keys
    • 1.Bb4!
      • threat
        • 2.Qb5#
      • 1...Kxb4
        • 2.Qb5#
      • 1...Rxb4
        • 2.Qa8#
      • 1...Bc3
        • 2.Sxb6#
      • 1...b5
        • 2.Qxb5#
      • 1...Bc5
        • 2.Sxb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(c);S_CUTR(b)::QAB1(G)
    • R(b);N_GUARD::QAB1(G)
    • R(b);N_GUARD::QAB1(G),XR(b)
    • P(f);OGATE,XB(F)::QAR1(G),XP(f)
  • Tries
    • Try
      • B(A);CHECK,N_SPINS(D),XQ(c)
      • Vars
        • R(b);P_PINS(D),XB(A)::QAB1(G)
      • Refutation
        • R(a);P_PINS(D),XB(A)
    • Try
      • Q(G);CHECK,N_SPINS(D)
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB1(G),XR(b)
      • Refutation
        • P(f);P_SPINP(f)
    • Try
      • Q(G);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAB1(G),XR(b)
      • Refutation
        • P(f);P_SPINP(f)
  • Actual
    • B(F);
    • Threat
      • QAB1(G)
    • Vars
      • K(d);N_SPINQ(c),P-FLIGHT,XB(F)::QAR1(G)
      • R(b);SBLOCK,XB(F)::QAR(G)
      • B(e);N_PINS(D)::S(D),XP(f)
      • P(f);::QAB1(G),XP(f)
      • B(e);N_PINS(D)::S(D),XR(b)
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