MESON Chess Problem Database

Problem Display
PID: 234740 (4KB2/1n3R2/4k3/2Q3r1/8/8/8/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2013

4KB2/1n3R2/4k3/2Q3r1/8/8/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1
      • 2.Qf5#
    • 1...Rg2
      • 2.Qf5#
    • 1...Rg3
      • 2.Qf5#
    • 1...Rg4
      • 2.Qf5#
    • 1...Rd5
      • 2.Qe7#
    • 1...Rf5
      • 2.Qxf5#
    • 1...Rg6
      • 2.Qf5#
    • 1...Rg7
      • 2.Qf5#
    • 1...Rg8
      • 2.Qf5#
    • 1...Sa5
      • 2.Qd6#
    • 1...Sd6+
      • 2.Qxd6#
    • 1...Sd8
      • 2.Qd6#
  • Tries
    • 1.Qc6+?
      • 1...Sd6+
        • 2.Qxd6#
      • 1...Ke5!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Rf6#
      • 1...Sd6+
        • 2.Qxd6#
      • 1...Re5
        • 2.Qd7#
      • 1...Rf5
        • 2.Re7#
      • 1...Rg6
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • R(a);N_GUARD::QAB1(A)
    • R(a);SBLOCK::QAR1(A)
    • R(a);N_GUARD::QAB1(A),XR(a)
    • R(a);N_GUARD,P_PINB(D)::QAB1(A)
    • S(c);N_GUARD::QAR1(A)
    • S(c);CHECK,N_GUARD::QAR1(A),XS(c)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • S(c);CHECK,N_GUARD,P_SPINS(c)::QAR1(A),XS(c)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • R1(B)
    • Vars
      • S(c);CHECK,N_GUARD::QAR1(A),XS(c)
      • R(a);SBLOCK::QAB1(A)
      • R(a);SBLOCK::R1(B)
      • R(a);N_GUARD::QAR2(A)
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