MESON Chess Problem Database

Problem Display
PID: 226875 (8/2N5/2N5/8/8/3k4/1p3QP1/bK6 w - - 0 1)

Speckmann, Werner

US Problem Bulletin, 1984

8/2N5/2N5/8/8/3k4/1p3QP1/bK6

#2

5 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Qc2#
    • 1...Kc4
      • 2.Qc2#
    • 1...Ke4
      • 2.Qf3#
  • Tries
    • 1.Sb5?
      • 1...Ke4
        • 2.Qf3#
      • 1...Kc4!
    • 1.Sd5?
      • threat
        • 2.Qc2#
      • 1...Ke4
        • 2.Qf3#
      • 1...Kc4!
    • 1.Sa6?
      • 1...Kc3
        • 2.Qc2#
      • 1...Ke4
        • 2.Qf3#
      • 1...Kc4!
    • 1.Se6?
      • 1...Kc3
        • 2.Qc2#
      • 1...Ke4
        • 2.Qf3#
      • 1...Kc4!
    • 1.Sa8?
      • 1...Kc3
        • 2.Qc2#
      • 1...Ke4
        • 2.Qf3#
      • 1...Kc4!
    • 1.Se8?
      • 1...Kc3
        • 2.Qc2#
      • 1...Ke4
        • 2.Qf3#
      • 1...Kc4!
    • 1.Qe2+?
      • 1...Kc3
        • 2.Qc2#
      • 1...Kxe2!
    • 1.g3?
      • 1...Kc3
        • 2.Qc2#
      • 1...Kc4
        • 2.Qc2#
      • 1...Ke4!
    • 1.g4?
      • 1...Kc3
        • 2.Qc2#
      • 1...Kc4
        • 2.Qc2#
      • 1...Ke4!
  • Keys
    • 1.Qc2+!
      • 1...Ke3
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • K(c);P-FLIGHT::QAR1(B)
    • K(c);S_FLIGHT::QAR2(B)
    • K(c);S_FLIGHT::QAB1(B)
  • Tries
    • Try
      • S(E);
      • Vars
        • K(c);S_FLIGHT::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(E);
      • Threat
        • QAB1(B)
      • Vars
        • K(c);S_FLIGHT::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(E);
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
        • K(c);S_FLIGHT::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(E);
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
        • K(c);S_FLIGHT::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(E);
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
        • K(c);S_FLIGHT::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(E);
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
        • K(c);S_FLIGHT::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
      • Refutation
        • K(c);S_FLIGHT,XQ(B)
    • Try
      • P(C);
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
        • K(c);S_FLIGHT::QAR2(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • P(C);
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
        • K(c);S_FLIGHT::QAR2(B)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(B);CHECK
    • Vars
      • K(c);P-FLIGHT::S(E)
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