MESON Chess Problem Database

Problem Display
PID: 87635 (3N1B2/3N4/8/1p1k4/pp1p4/5K2/8/QB6 w - - 0 1)

Maltby, John

The Problemist, 1992

3N1B2/3N4/8/1p1k4/pp1p4/5K2/8/QB6

#2

6 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...d3
      • 2.Sb6#
  • Tries
    • 1.Bc2?
      • 1...Kc4
        • 2.Sb6#
      • 1...a3
        • 2.Bb3#
      • 1...d3
        • 2.Sb6#
      • 1...b3!
    • 1.Bxb4?
      • threat
        • 2.Ba2#
        • 2.Qa2#
      • 1...d3
        • 2.Sb6#
        • 2.Ba2#
      • 1...Kc4!
    • 1.Bc5?
      • threat
        • 2.Qxd4#
      • 1...d3
        • 2.Qd4#
      • 1...Kc4!
    • 1.Qb2?
      • 1...Kc4
        • 2.Sb6#
      • 1...a3
        • 2.Qb3#
      • 1...d3
        • 2.Sb6#
      • 1...b3!
    • 1.Qc3?
      • threat
        • 2.Be4#
        • 2.Qc5#
        • 2.Qc6#
      • 1...bxc3
        • 2.Ba2#
      • 1...d3
        • 2.Sb6#
        • 2.Sf6#
        • 2.Qxd3#
        • 2.Qc5#
      • 1...dxc3!
  • Keys
    • 1.Qa3!
      • 1...Kc4
        • 2.Sb6#
      • 1...bxa3
        • 2.Ba2#
      • 1...d3
        • 2.Qxd3#
      • 1...b3
        • 2.Qc5#

FEATURES

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