MESON Chess Problem Database

Problem Display
PID: 134890 (3NkBK1/2pp1Np1/2R5/4q3/Q7/7B/8/8 w - - 0 1)

Rice, John Michael

The Problemist, 2009

3NkBK1/2pp1Np1/2R5/4q3/Q7/7B/8/8

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Re6#
    • 1...Qb2
      • 2.Re6#
    • 1...Qh2
      • 2.Re6#
    • 1...Qc3
      • 2.Re6#
    • 1...Qg3
      • 2.Re6#
    • 1...Qd4
      • 2.Re6#
    • 1...Qf4
      • 2.Re6#
    • 1...Qe4
      • 2.Qxe4#
    • 1...Qa5
      • 2.Re6#
    • 1...Qh5
      • 2.Re6#
    • 1...Qe6
      • 2.Rxe6#
    • 1...dxc6
      • 2.Qxc6#
    • 1...d5
      • 2.Re6#
      • 2.Rxc7#
  • Keys
    • 1.Se6!
      • threat
        • 2.Qa8#
      • 1...dxc6
        • 2.Qxc6#
      • 1...dxe6
        • 2.Rxe6#
      • 1...d5
        • 2.Rxc7#
      • 1...d6
        • 2.Sxc7#
      • 1...Qa1
        • 2.Sxc7#
      • 1...Qb2
        • 2.Sxc7#
      • 1...Qf6
        • 2.Sxc7#
      • 1...Qa5
        • 2.Sxg7#
      • 1...Qb5
        • 2.Sxc7#
        • 2.Sxg7#
      • 1...Qg5
        • 2.Sxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • Q(a);N_GUARD::R(C)
    • Q(a);OGATEB::QAR(B),XQ(a)
    • Q(a);N_GUARD,P_PINS(D)::R(C),XQ(a)
    • P(c);OGATE,P_SPINP(c),XR(C)::QAB(B),XP(c)
  • Actual
    • S(E);
    • Threat
      • QAR(B)
    • Vars
      • P(c);OGATE,P_SPINP(c),XR(C)::QAB(B),XP(c)
      • P(c);OGATE,XS(E)::QAB(B)+R(C),DCHECK,XP(c)
      • P(c);OGATEB::QAB(B)+R(C),XP(b)
      • P(c);S_CUTQ(a)::S(E),XP(b)
      • Q(a);N_GUARD::S(E),XP(b)
      • Q(a);N_GUARD::S(E),XP(d)
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