MESON Chess Problem Database

Problem Display
PID: 123 (4K3/Rp6/q2B4/1B6/1PP5/k7/8/nQ6 w - - 0 1)

Mansfield, Comins

The Problemist, 1930

4K3/Rp6/q2B4/1B6/1PP5/k7/8/nQ6

#2

7 + 4

3202 Complete Mansfield/I 1996
3310 2345 Chess Problems 1997
14869 British Championship Solving Ty. 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Qa4
      • 2.Rxa4#
    • 1...Qa5
      • 2.Rxa5#
      • 2.bxa5#
    • 1...b6
      • 2.Rxa6#
  • Tries
    • 1.Bxa6?
      • threat
        • 2.Bb5#
        • 2.Bxb7#
      • 1...Ka4
        • 2.Bb5#
        • 2.Bxb7#
        • 2.Qa2#
      • 1...bxa6
        • 2.Rxa6#
      • 1...b5
        • 2.Bxb5#
        • 2.Bb7#
        • 2.Bc8#
      • 1...b6
        • 2.Bb5#
        • 2.Bb7#
        • 2.Bc8#
      • 1...Sb3!
  • Keys
    • 1.Ba4!
      • threat
        • 2.Qxa1#
      • 1...Qb5+
        • 2.Bxb5#
      • 1...Qxa4+
        • 2.b5#
      • 1...Qc6+
        • 2.Bxc6#
      • 1...Kxa4
        • 2.Qa2#
      • 1...Qxc4
        • 2.Bb5#
      • 1...Qxd6
        • 2.Bc6#
      • 1...Sc2
        • 2.Qb3#
      • 1...Sb3
        • 2.Qxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • Q(c);OGATE,P_PINB(D)::R1(F),XQ(c)
    • P(d);N_GUARD::R(F),XQ(c)
  • Tries
    • Try
      • B(D);XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • P(d);OGATE,P_SPINP(d),XB(D)::R(F),XP(d)
      • Refutation
        • S(a);
  • Actual
    • B(D);N_PINQ(c)
    • Threat
      • QAR2(A),XS(a)
    • Vars
      • Q(c);CHECK,OGATEB::R(F)+B(D),XQ(c)
      • Q(c);CHECK,N_GUARD,P_SPINQ(c),XB(D)::B(E)+P(B)
      • K(b);P-FLIGHT,P_SPINQ(c),XB(D)::QAR2(A)
      • Q(c);OGATEB,XP(C)::R(F)+B(D)
      • Q(c);OGATEB,XB(E)::R(F)+B(D)
      • S(a);N_GUARD::QAR1(A)
      • S(a);N_GUARD::QAR1(A),XS(a)
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