MESON Chess Problem Database

Problem Display
PID: 39731 (8/8/2nK4/1N6/4k1B1/6Q1/6b1/8 w - - 0 1)

Lincoln, Robert A

More Fun with Chess Miniatures, 2000

8/8/2nK4/1N6/4k1B1/6Q1/6b1/8

#2

4 + 3

5454 Near Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bf1
      • 2.Qf3#
    • 1...Bf3
      • 2.Qxf3#
    • 1...Bh3
      • 2.Qf3#
    • 1...Sd4
      • 2.Sc3#
  • Tries
    • 1.Be2?
      • threat
        • 2.Bd3#
      • 1...Bf3
        • 2.Qxf3#
      • 1...Bf1
        • 2.Qf3#
      • 1...Sb4
        • 2.Qe5#
      • 1...Se5
        • 2.Qxe5#
      • 1...Kf5!
    • 1.Qe1+?
      • 1...Kd3
        • 2.Qe2#
      • 1...Kf4!
    • 1.Qe5+?
      • 1...Kd3
        • 2.Qe2#
      • 1...Sxe5!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Bf5#
      • 1...Kd3
        • 2.Qe2#
      • 1...Bf3
        • 2.Qxf3#
      • 1...Bh3
        • 2.Qf3#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Se7
        • 2.Qd4#

This anticipates 226632(2004)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD::QAB1(A)
    • B(a);N_GUARD::QAB1(A),XB(a)
    • S(c);SBLOCK::S(C)
  • Tries
    • Try
      • B(B);
      • Threat
        • B(B)
      • Vars
        • B(a);N_GUARD::QAB1(A),XB(a)
        • B(a);N_GUARD::QAB1(A)
        • S(c);N_GUARD::QAR1(A)
        • S(c);N_GUARD::QAR1(A),XS(c)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAB1(A)
      • Refutation
        • S(c);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • B(B)
    • Vars
      • K(b);S_FLIGHT::QAB1(A)
      • B(a);N_GUARD::QAB1(A),XB(a)
      • B(a);N_GUARD::QAB1(A)
      • S(c);N_GUARD::QAR1(A),XS(c)
      • S(c);N_GUARD::QAR1(A)
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