MESON Chess Problem Database

Problem Display
PID: 23368 (8/8/8/2Q5/8/7n/2pKR2P/5k2 w - - 0 1)

Lincoln, Robert A

The Problemist Supplement, 1999

8/8/8/2Q5/8/7n/2pKR2P/5k2

#2

4 + 3

2786 More Fun with Chess Miniatures 2000

SOLUTION

  • SOUND
  • Sets
    • 1...Sg1
      • 2.Rf2#
      • 2.Qf2#
    • 1...Sf2
      • 2.Qxf2#
    • 1...Sf4
      • 2.Qf2#
    • 1...Sg5
      • 2.Qf2#
    • 1...c1Q+
      • 2.Qxc1#
    • 1...c1S
      • 2.Qxc1#
    • 1...c1B+
      • 2.Qxc1#
    • 1...c1R
      • 2.Qxc1#
  • Tries
    • 1.Kc1?
      • 1...Sf2
        • 2.Qxf2#
      • 1...Sg1
        • 2.Qf2#
      • 1...Sf4
        • 2.Qf2#
      • 1...Sg5
        • 2.Qf2#
      • 1...Kxe2!
    • 1.Kxc2?
      • 1...Sf2
        • 2.Qxf2#
      • 1...Sg1
        • 2.Qf2#
      • 1...Sf4
        • 2.Qf2#
      • 1...Sg5
        • 2.Qf2#
      • 1...Kxe2!
    • 1.Kd3?
      • 1...Sf2+
        • 2.Qxf2#
      • 1...c1S+
        • 2.Qxc1#
      • 1...c1Q
        • 2.Qxc1#
      • 1...c1B
        • 2.Qxc1#
      • 1...c1R
        • 2.Qxc1#
      • 1...Sg1
        • 2.Qf2#
      • 1...Sg5
        • 2.Qf2#
      • 1...Sf4+!
    • 1.Qa3?
      • threat
        • 2.Qc1#
      • 1...c1Q+
        • 2.Qxc1#
      • 1...c1B+
        • 2.Qxc1#
      • 1...Kg1
        • 2.Qc1#
      • 1...c1S
        • 2.Qxc1#
      • 1...c1R
        • 2.Qxc1#
      • 1...Sf2!
    • 1.Qxc2?
      • threat
        • 2.Qb1#
        • 2.Qd1#
        • 2.Qc1#
      • 1...Kg1
        • 2.Qb1#
        • 2.Qd1#
        • 2.Qc1#
      • 1...Sf2!
  • Keys
    • 1.Qc6!
      • threat
        • 2.Qg2#
      • 1...c1Q+
        • 2.Qxc1#
      • 1...c1B+
        • 2.Qxc1#
      • 1...Kg1
        • 2.Qg2#
      • 1...Sf4
        • 2.Qh1#
      • 1...Sf2
        • 2.Re1#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • S(c);N_GUARD::QAR1(D),XS(c)
    • S(c);N_GUARD::QAR1(D)
    • P(b);CHECK,OGATE::QAR(D),XQ(b)
    • P(b);OGATE::QAR(D),XS(b)
    • P(b);CHECK,OGATE::QAR(D),XB(b)
    • P(b);OGATE::QAR(D),XR(b)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Vars
        • S(c);N_GUARD::QAR1(D),XS(c)
        • S(c);N_GUARD::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
    • Try
      • K(A);P-FLIGHT,XP(b)
      • Vars
        • S(c);N_GUARD::QAR1(D),XS(c)
        • S(c);N_GUARD::QAR1(D)
      • Refutation
        • K(a);S_FLIGHT,XR(B)
    • Try
      • K(A);P-FLIGHT
      • Vars
        • S(c);CHECK,N_GUARD::QAR1(D),XS(c)
        • P(b);CHECK,OGATE::QAR(D),XS(b)
        • P(b);OGATE::QAR(D),XQ(b)
        • P(b);OGATE::QAR(D),XB(b)
        • P(b);OGATE::QAR(D),XR(b)
        • S(c);N_GUARD::QAR1(D)
      • Refutation
        • S(c);CHECK
    • Try
      • Q(D);
      • Threat
        • QAR(D)
      • Vars
        • P(b);CHECK::QAR(D),XQ(b)
        • P(b);CHECK::QAR(D),XB(b)
        • K(a);P-FLIGHT::QAR(D)
        • P(b);::QAR(D),XS(b)
        • P(b);::QAR(D),XR(b)
      • Refutation
        • S(c);
    • Try
      • Q(D);XP(b)
      • Threat
        • DUALS(3)
      • Refutation
        • S(c);
  • Actual
    • Q(D);
    • Threat
      • QAB1(D)
    • Vars
      • P(b);CHECK,OGATE::QAR(D),XQ(b)
      • P(b);CHECK,OGATE::QAR(D),XB(b)
      • K(a);P-FLIGHT::QAR1(D)
      • S(c);N_GUARD::QAR2(D)
      • S(c);SBLOCK::R1(B)
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