MESON Chess Problem Database

Problem Display
PID: 234452 (8/8/8/8/3B2K1/8/6kp/4QNb1 w - - 0 1)

Lincoln, Robert A

ChessStar, 2013

8/8/8/8/3B2K1/8/6kp/4QNb1

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kh1
      • 2.Qe4#
    • 1...Be3
      • 2.Sxe3#
  • Tries
    • 1.Qf2+?
      • 1...Kh1
        • 2.Sg3#
        • 2.Qf3#
      • 1...Bxf2!
    • 1.Qg3+?
      • 1...Kh1
        • 2.Qf3#
      • 1...Kxf1!
    • 1.Qe2+?
      • 1...Kh1
        • 2.Sg3#
        • 2.Qf3#
        • 2.Qe4#
      • 1...Bf2!
  • Keys
    • 1.Sd2!
      • threat
        • 2.Qe4#
      • 1...Kh1
        • 2.Qe4#
      • 1...Bxd4
        • 2.Qf1#
      • 1...h1Q
        • 2.Qg3#
      • 1...h1S
        • 2.Qxg1#
      • 1...h1B
        • 2.Qg3#
        • 2.Qxg1#
      • 1...h1R
        • 2.Qg3#
      • 1...Bf2
        • 2.Qf1#
      • 1...Be3
        • 2.Qf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT::QAB(A)
    • B(a);N_GUARD::S(B),XB(a)
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • B(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB(A)
      • Refutation
        • K(b);S_FLIGHT,XS(B)
    • Try
      • Q(A);CHECK
      • Refutation
        • B(a);P_SPINB(a)
  • Actual
    • S(B);
    • Threat
      • QAB(A)
    • Vars
      • K(b);P_SPINB(a),S_FLIGHT::QAB(A)
      • B(a);XB(C)::QAB1(A)
      • P(c);SBLOCK::QAR1(A)
      • P(c);N_GUARD::QAR1(A),XB(a)
      • B(a);::QAB1(A)
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