MESON Chess Problem Database

Problem Display
PID: 244951 (5bQ1/K7/3pn3/NRnk2p1/3P2q1/5pp1/8/B2NR3 w - - 0 1)

Shire, David J

The Problemist, 1989

5bQ1/K7/3pn3/NRnk2p1/3P2q1/5pp1/8/B2NR3

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qh5
      • 2.Qxe6#
    • 1...Qxd4
      • 2.Qxe6#
    • 1...Qf4
      • 2.Qxe6#
    • 1...Qh4
      • 2.Qxe6#
    • 1...Bh6
      • 2.Qa8#
    • 1...Be7
      • 2.Qa8#
    • 1...Bg7
      • 2.Qa8#
  • Tries
    • 1.Rxe6?
      • threat
        • 2.Se3#
        • 2.Re5#
      • 1...Qxd4
        • 2.Re1#
        • 2.Re2#
        • 2.Re3#
        • 2.Re7#
        • 2.Re8#
      • 1...Qe4
        • 2.Re5#
      • 1...Qf4
        • 2.Re5#
      • 1...Qxe6!
    • 1.Rb4?
      • threat
        • 2.Sc3#
      • 1...Qxd4
        • 2.Rxd4#
      • 1...Se4
        • 2.Se3#
      • 1...Sa4!
    • 1.dxc5?
      • threat
        • 2.c6#
      • 1...Qa4
        • 2.Qxe6#
      • 1...Qb4
        • 2.Qxe6#
      • 1...Qc4
        • 2.Qxe6#
      • 1...Qd4
        • 2.Qxe6#
      • 1...dxc5!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Se3#
      • 1...Qxd4
        • 2.Qxe6#
      • 1...Sxd4
        • 2.Sc3#
      • 1...Qf5
        • 2.Qxf5#
      • 1...Qe4
        • 2.Qxe4#
      • 1...Qf4
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(c);N_GUARD::QAB1(H),XS(h)
    • Q(c);N_GUARD,XP(D)::QAB1(H),XS(h)
    • B(i);OGATE::QAB(H)
  • Tries
    • Try
      • R(C);XS(h)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);::QAB(H)+R(C),DCHECK
      • Refutation
        • Q(c);P_SPINQ(c),XR(C)
    • Try
      • R(F);N_PINS(d),P_PINS(h)
      • Threat
        • S(B)
      • Vars
        • Q(c);OGATE,XP(D)::R1(F),XQ(c)
        • S(d);SBLOCK::S(B)
      • Refutation
        • S(d);
    • Try
      • P(D);P_PINS(h),XS(d)
      • Threat
        • R(F)+P(D)
      • Vars
        • Q(c);N_GUARD,P_PINS(E)::QAB1(H),XS(h)
        • Q(c);N_GUARD::QAB1(H),XS(h)
        • Q(c);N_GUARD,P_PINP(D)::QAB1(H),XS(h)
      • Refutation
        • P(g);P_SPINP(g),XP(D)
  • Actual
    • Q(H);
    • Threat
      • S(B)
    • Vars
      • Q(c);N_GUARD,XP(D)::QAB1(H),XS(h)
      • S(h);SBLOCK,XP(D)::S(B)
      • Q(c);N_GUARD::QAR2(H),XQ(c)
      • Q(c);N_GUARD::QAB1(H),XQ(c)
      • Q(c);N_GUARD::QAB1(H),XS(h)
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