MESON Chess Problem Database

Problem Display
PID: 169019 (8/8/n7/1p6/k2B4/1N1Q4/1K6/8 w - - 0 1)

Lincoln, Robert A

SuperProblem, 2017

8/8/n7/1p6/k2B4/1N1Q4/1K6/8

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...b4
      • 2.Qxa6#
  • Tries
    • 1.Sa1?
      • threat
        • 2.Qa3#
      • 1...Ka5
        • 2.Qa3#
      • 1...b4
        • 2.Qxa6#
      • 1...Kb4!
    • 1.Sc1?
      • threat
        • 2.Qa3#
      • 1...Ka5
        • 2.Qa3#
      • 1...b4
        • 2.Qxa6#
      • 1...Kb4!
    • 1.Sa5?
      • threat
        • 2.Qa3#
      • 1...Kb4
        • 2.Qa3#
      • 1...Kxa5
        • 2.Qa3#
      • 1...b4!
    • 1.Sc5+?
      • 1...Kb4
        • 2.Qc3#
      • 1...Sxc5
        • 2.Qa3#
      • 1...Ka5!
    • 1.Bc3?
      • 1...Sc5
        • 2.Sxc5#
      • 1...Sc7
        • 2.Sc5#
      • 1...Sb8
        • 2.Sc5#
      • 1...b4
        • 2.Qxa6#
        • 2.Qd7#
      • 1...Sb4!
    • 1.Qc3?
      • threat
        • 2.Qa5#
      • 1...b4
        • 2.Qc6#
      • 1...Sb4!
  • Keys
    • 1.Sd2!
      • threat
        • 2.Qa3#
      • 1...Kb4
        • 2.Qa3#
      • 1...Ka5
        • 2.Qa3#
      • 1...b4
        • 2.Qxa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATE,SBLOCK::QAR2(C),XS(c)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
        • P(b);OGATE,SBLOCK::QAR2(C),XS(c)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(B);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);P-FLIGHT::QAR2(C)
        • P(b);OGATE,SBLOCK::QAR2(C),XS(c)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(B);
      • Threat
        • QAR1(C)
      • Vars
        • K(a);P-FLIGHT::QAB1(C)
        • K(a);P-FLIGHT,XS(B)::QAR2(C)
      • Refutation
        • P(b);
    • Try
      • S(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAB1(C)
        • S(c);XS(B)::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • B(D);
      • Vars
        • S(c);N_GUARD::S(B),XS(c)
        • S(c);N_GUARD::S(B)
      • Refutation
        • S(c);
    • Try
      • Q(C);
      • Threat
        • QAR1(C)
      • Vars
        • P(b);OGATEB,SBLOCK::QAB(C)
      • Refutation
        • S(c);
  • Actual
    • S(B);
    • Threat
      • QAR1(C)
    • Vars
      • K(a);P-FLIGHT::QAB1(C)
      • K(a);P-FLIGHT::QAR2(C)
      • P(b);OGATE,SBLOCK::QAR2(C),XS(c)
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