MESON Chess Problem Database

Problem Display
PID: 166424 (8/Q7/R7/8/8/p1p5/k1K5/2b5 w - - 0 1)

Lincoln, Robert A

T.GAMA, 1997

8/Q7/R7/8/8/p1p5/k1K5/2b5

#2

3 + 4

15148 Sadier Collection 2018
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bd2
      • 2.Rxa3#
    • 1...Be3
      • 2.Rxa3#
    • 1...Bf4
      • 2.Rxa3#
    • 1...Bg5
      • 2.Rxa3#
    • 1...Bh6
      • 2.Rxa3#
  • Tries
    • 1.Kxc1?
      • threat
        • 2.Rxa3#
      • 1...Ka1
        • 2.Rxa3#
      • 1...Kb3!
    • 1.Qb6?
      • threat
        • 2.Qb1#
      • 1...Ka1
        • 2.Qb1#
      • 1...Bb2!
    • 1.Qb8?
      • threat
        • 2.Qb1#
      • 1...Ka1
        • 2.Qb1#
      • 1...Bb2!
    • 1.Qb7?
      • threat
        • 2.Qb1#
      • 1...Ka1
        • 2.Qb1#
      • 1...Bb2!
  • Keys
    • 1.Qg1!
      • 1...Ka1
        • 2.Rxa3#
      • 1...Bb2
        • 2.Qb1#
      • 1...Bd2
        • 2.Qb1#
      • 1...Be3
        • 2.Qb1#
      • 1...Bf4
        • 2.Qb1#
      • 1...Bg5
        • 2.Qb1#
      • 1...Bh6
        • 2.Qb1#

Anticipated by 10801(1968)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 5
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::R1(B),XP(c)
  • Tries
    • Try
      • K(A);P-FLIGHT,XB(a)
      • Threat
        • R1(B),XP(c)
      • Vars
        • K(b);P-FLIGHT::R(B),XP(c)
      • Refutation
        • K(b);N_SPINP(c),S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
      • Refutation
        • B(a);
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
      • Refutation
        • B(a);
    • Try
      • Q(C);
      • Threat
        • QAB1(C)
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
      • Refutation
        • B(a);
  • Actual
    • Q(C);
    • Vars
      • K(b);P-FLIGHT,P_SPINB(a)::R(B),XP(c)
      • B(a);OGATE::QAB1(C)
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