MESON Chess Problem Database

Problem Display
PID: 67767 (4B3/1p6/5R2/2k5/4QK2/8/2n5/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2006

4B3/1p6/5R2/2k5/4QK2/8/2n5/8

#2

4 + 3

5454 Near Snap 2007
5454 Near Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...b5
      • 2.Rc6#
  • Tries
    • 1.Ke5?
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sa1
        • 2.Qd4#
      • 1...Se1
        • 2.Qd4#
      • 1...Sa3
        • 2.Qd4#
      • 1...Se3
        • 2.Qd4#
      • 1...Sb4
        • 2.Qd4#
      • 1...b5
        • 2.Rc6#
      • 1...b6!
    • 1.Rf5+?
      • 1...Kd6
        • 2.Qe5#
      • 1...Kb6!
  • Keys
    • 1.Rd6!
      • 1...Kxd6
        • 2.Qe5#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sa1
        • 2.Qd4#
      • 1...Se1
        • 2.Qd4#
      • 1...Sa3
        • 2.Qd4#
      • 1...Se3
        • 2.Qd4#
      • 1...Sb4
        • 2.Qd4#
      • 1...b5
        • 2.Rc6#
      • 1...b6
        • 2.Rd5#

Anticipated by 51734(1960)

This anticipates 174082(2012)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • P(c);N_GUARD,SBLOCK::R1(C)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Vars
        • S(a);N_GUARD::QAB1(A),XS(a)
        • S(a);N_GUARD::QAB1(A)
        • P(c);N_GUARD,SBLOCK::R1(C)
      • Refutation
        • P(c);
    • Try
      • R(C);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • R(C);
    • Vars
      • K(b);S_FLIGHT,XR(C)::QAB1(A)
      • S(a);N_GUARD::QAB1(A),XS(a)
      • S(a);N_GUARD::QAB1(A)
      • P(c);N_GUARD,SBLOCK::R1(C)
      • P(c);SBLOCK::R1(C)
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