MESON Chess Problem Database

Problem Display
PID: 134043 (4k3/3q4/2n2Q2/8/B7/3R4/8/2K5 w - - 0 1)

Lipton, Michael

The Problemist, 2009

4k3/3q4/2n2Q2/8/B7/3R4/8/2K5

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Qh3
      • 2.Rd8#
    • 1...Qg4
      • 2.Rd8#
    • 1...Qf5
      • 2.Rd8#
    • 1...Qe6
      • 2.Rd8#
    • 1...Qa7
      • 2.Rd8#
    • 1...Qb7
      • 2.Rd8#
    • 1...Qf7
      • 2.Rd8#
      • 2.Qd8#
    • 1...Qg7
      • 2.Rd8#
    • 1...Qh7
      • 2.Rd8#
    • 1...Qd8
      • 2.Rxd8#
    • 1...Sb4
      • 2.Bxd7#
      • 2.Re3#
    • 1...Sa5
      • 2.Bxd7#
      • 2.Re3#
    • 1...Sa7
      • 2.Bxd7#
      • 2.Re3#
    • 1...Sb8
      • 2.Re3#
    • 1...Sd8
      • 2.Bxd7#
  • Tries
    • 1.Rxd7?
      • threat
        • 2.Rd8#
        • 2.Qf7#
      • 1...Se5
        • 2.Rd8#
        • 2.Qe7#
        • 2.Qd8#
        • 2.Qh8#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sd8
        • 2.Re7#
        • 2.Rxd8#
        • 2.Qe7#
        • 2.Qxd8#
        • 2.Qh8#
      • 1...Kxd7!
  • Keys
    • 1.Re3+!
      • 1...Qe6
        • 2.Bxc6#
      • 1...Qe7
        • 2.Qxe7#
      • 1...Se5
        • 2.Rxe5#
      • 1...Se7
        • 2.Qxe7#

This is a version of 9919

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 10
  • Sets
    • Q(b);OGATE,P_SPINS(a)::R1(B)
    • Q(b);OGATE,P_SPINS(a)::R1(B),XQ(b)
    • S(a);N_GUARD,P_SPINQ(b)::R(B)
    • S(a);OGATE,P_SPINQ(b)::B(C),XQ(b)
  • Tries
    • Try
      • R(B);XQ(b)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);N_GUARD::QAR1(D),XS(a)
      • Refutation
        • K(c);P_SPINS(a),S_FLIGHT,XR(B)
  • Actual
    • R(B);CHECK
    • Vars
      • Q(b);P_SPINQ(b),P_SPINS(a)::B(C),XS(a)
      • Q(b);N_GUARD,P_SPINQ(b),P_SPINS(a)::QAR1(D),XQ(b)
      • S(a);N_GUARD,P_SPINQ(b),P_SPINS(a)::R(B),XS(a)
      • S(a);N_GUARD,P_SPINQ(b),P_SPINS(a)::QAR1(D),XS(a)
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Developed and maintained by Brian Stephenson.
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