MESON Chess Problem Database

Problem Display
PID: 255566 (8/4K3/1PP1N3/2ppkPp1/Q7/3p2N1/8/8 w - - 0 1)

Witt, Andreas

Problemist Ukraini, 2021

8/4K3/1PP1N3/2ppkPp1/Q7/3p2N1/8/8

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...g4
      • 2.Qf4#
  • Tries
    • 1.Sxc5?
      • threat
        • 2.Sxd3#
        • 2.Sd7#
      • 1...d2
        • 2.Sd3#
        • 2.Sd7#
      • 1...d4!
    • 1.Qd1?
      • threat
        • 2.Qe1#
      • 1...d2
        • 2.Qe2#
      • 1...d4!
    • 1.Qa3?
      • 1...d4
        • 2.Qxc5#
      • 1...c4
        • 2.Qd6#
      • 1...d2
        • 2.Qe3#
      • 1...g4!
    • 1.Qc4?
      • 1...d2
        • 2.Qe2#
      • 1...d4
        • 2.Qxc5#
      • 1...g4
        • 2.Qf4#
      • 1...dxc4!
    • 1.Qh4?
      • threat
        • 2.Qh8#
      • 1...d4
        • 2.Qe4#
      • 1...gxh4!
    • 1.Qa5?
      • threat
        • 2.Qe1#
      • 1...d4
        • 2.Qxc5#
      • 1...d2!
    • 1.b7?
      • threat
        • 2.b8Q#
        • 2.b8B#
      • 1...d2
        • 2.b8Q#
        • 2.b8B#
      • 1...c4
        • 2.b8Q#
        • 2.b8B#
      • 1...g4
        • 2.Qf4#
        • 2.b8Q#
        • 2.b8B#
      • 1...d4!
  • Keys
    • 1.Qg4!
      • 1...d4
        • 2.Qe4#
      • 1...d2
        • 2.Qe2#
      • 1...c4
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(e);N_GUARD::QAB1(B)
  • Tries
    • Try
      • S(F);XP(b)
      • Threat
        • DUALS(2)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • P(a);N_GUARD::QAR(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Vars
        • P(c);OGATEB::QAR2(B),XP(b)
        • P(b);OGATE::QAB1(B)
        • P(a);OGATE::QAR2(B)
      • Refutation
        • P(e);
    • Try
      • Q(B);
      • Vars
        • P(a);OGATE::QAR(B)
        • P(c);OGATEB::QAR2(B),XP(b)
        • P(e);N_GUARD::QAB1(B)
      • Refutation
        • P(c);XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAB(B)
      • Vars
        • P(c);N_GUARD::QAR1(B)
      • Refutation
        • P(e);XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • P(c);OGATEB,P_SPINP(b)::QAR2(B),XP(b)
      • Refutation
        • P(a);
    • Try
      • P(D);
      • Threat
        • P=Q
      • Vars
        • P(a);::P=Q
        • P(b);::P=Q
      • Refutation
        • P(c);
  • Actual
    • Q(B);
    • Vars
      • P(c);N_GUARD::QAR1(B)
      • P(a);N_GUARD::QAR(B)
      • P(b);N_GUARD::QAB1(B)
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