MESON Chess Problem Database

Problem Display
PID: 234623 (8/8/8/1B6/2p5/Pk6/3Q4/K1b5 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2004

8/8/8/1B6/2p5/Pk6/3Q4/K1b5

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa3
      • 2.Qc3#
    • 1...Bb2+
      • 2.Qxb2#
    • 1...c3
      • 2.Qa2#
  • Tries
    • 1.Ba4+?
      • 1...Kxa4
        • 2.Qb4#
      • 1...Kxa3!
    • 1.Bxc4+?
      • 1...Kxa3
        • 2.Qa5#
      • 1...Ka4
        • 2.Qb4#
      • 1...Kxc4!
    • 1.Qd1+?
      • 1...Kxa3
        • 2.Qa4#
      • 1...Kc3!
    • 1.Qc2+?
      • 1...Kxa3
        • 2.Qa4#
        • 2.Qc3#
      • 1...Kxc2!
  • Keys
    • 1.Qd4!
      • 1...Bb2+
        • 2.Qxb2#
      • 1...Kc2
        • 2.Ba4#
      • 1...Kxa3
        • 2.Qc3#
      • 1...Bxa3
        • 2.Qxc4#
      • 1...c3
        • 2.Qa4#
      • 1...Bd2
        • 2.Qb2#
      • 1...Be3
        • 2.Qb2#
      • 1...Bf4
        • 2.Qb2#
      • 1...Bg5
        • 2.Qb2#
      • 1...Bh6
        • 2.Qb2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT,XP(C)::QAR2(B)
    • B(a);CHECK,N_GUARD::QAR1(B),XB(a)
    • P(c);SBLOCK::QAB1(B)
  • Tries
    • Try
      • B(D);CHECK
      • Vars
        • K(b);S_FLIGHT,XB(D)::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT,XP(C)
    • Try
      • B(D);CHECK,XP(c)
      • Vars
        • K(b);P-FLIGHT,XP(C)::QAR2(B)
        • K(b);S_FLIGHT::QAR1(B)
      • Refutation
        • K(b);S_FLIGHT,XB(D)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT,XP(C)::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
  • Actual
    • Q(B);
    • Vars
      • B(a);CHECK,N_GUARD::QAR1(B),XB(a)
      • K(b);S_FLIGHT::B(D)
      • K(b);P-FLIGHT,XP(C)::QAR2(B)
      • B(a);SBLOCK,XP(C)::QAB1(B),XP(c)
      • P(c);OGATE,SBLOCK::QAB1(B)
      • B(a);N_GUARD::QAR1(B)
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