MESON Chess Problem Database

Problem Display
PID: 17926 (2qn4/Q1Pk3r/1P1NnP2/4p3/2N3B1/8/7b/2RR1K2 w - - 0 1)

Mansfield, Comins

American Chess Bulletin, 1952

2qn4/Q1Pk3r/1P1NnP2/4p3/2N3B1/8/7b/2RR1K2

#2

10 + 7

3550 Complete Mansfield/II 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Kc6
      • 2.Sxe5#
    • 1...Qa6
      • 2.c8Q#
    • 1...Qb7
      • 2.c8Q#
    • 1...Qxc7
      • 2.Qxc7#
    • 1...Qa8
      • 2.c8Q#
    • 1...Qb8
      • 2.cxb8S#
      • 2.c8Q#
    • 1...Bg1
      • 2.Sxe5#
    • 1...Sb7
      • 2.Qa4#
    • 1...Sf7
      • 2.Qa4#
  • Tries
    • 1.Bxe6+?
      • 1...Kc6
        • 2.Sb2#
        • 2.Sa3#
        • 2.Se3#
        • 2.Sa5#
        • 2.Sxe5#
      • 1...Sxe6
        • 2.Qa4#
      • 1...Kxe6!
    • 1.cxd8Q+?
      • 1...Kc6
        • 2.Sa5#
        • 2.Sxe5#
      • 1...Kxd8!
    • 1.cxd8R+?
      • 1...Kc6
        • 2.Sa5#
        • 2.Sxe5#
      • 1...Kxd8!
  • Keys
    • 1.b7!
      • threat
        • 2.Sb6#
      • 1...Kc6
        • 2.Sxe5#
      • 1...Kxc7
        • 2.bxc8Q#
        • 2.bxc8R#
      • 1...Qxb7
        • 2.c8Q#
      • 1...Qxc7
        • 2.b8S#
      • 1...Bg1
        • 2.Sxe5#
      • 1...Sc6
        • 2.bxc8Q#
        • 2.bxc8B#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • K(d);N_SPINS(c),S_FLIGHT::R(A)+S(D),DCHECK,XP(b)
    • Q(f);OGATE,P_PINS(D)::P=Q
    • Q(f);OGATE::P=Q
    • Q(f);OGATE,P_SPINQ(f),XP(J)::QAR1(I),XQ(f)
    • B(a);N_GUARD::S(D),XP(b)
    • S(g);N_GUARD::QAB(I)
  • Tries
    • Try
      • B(E);CHECK,XS(c)
      • Vars
        • S(g);SBLOCK,XB(E)::QAB(I)
      • Refutation
        • K(d);S_FLIGHT,XB(E)
    • Try
      • P(J);CHECK,XS(g)
      • Refutation
        • K(d);N_SPINS(c),P-FLIGHT,XQ(J)
    • Try
      • P(J);CHECK,XS(g)
      • Refutation
        • K(d);N_SPINS(c),P-FLIGHT,XR(J)
  • Actual
    • P(F);
    • Threat
      • S(D)
    • Vars
      • K(d);N_SPINS(c),S_FLIGHT::R(A)+S(D),DCHECK,XP(b)
      • K(d);N_SPINS(c),P-FLIGHT,XP(J)::PXQ(f)=Q
      • Q(f);OGATE,XP(F)::P=Q
      • Q(f);N_GUARD,XP(J)::P=S
      • B(a);N_GUARD::S(D),XP(b)
      • S(g);SBLOCK::PXQ(f)=Q
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