MESON Chess Problem Database

Problem Display
PID: 234684 (R7/8/1Q6/8/8/p2KB3/1b6/1k6 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2010

R7/8/1Q6/8/8/p2KB3/1b6/1k6

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Bd4?
      • 1...Ka1
        • 2.Qxb2#
      • 1...Ka2
        • 2.Qxb2#
      • 1...a2
        • 2.Qxb2#
      • 1...Kc1!
    • 1.Qb3?
      • 1...a2
        • 2.Qxa2#
      • 1...Ka1!
  • Keys
    • 1.Bc1!
      • 1...Ka1
        • 2.Qxb2#
      • 1...Kxc1
        • 2.Qg1#
      • 1...Ka2
        • 2.Qxb2#
      • 1...a2
        • 2.Qxb2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(B);
      • Vars
        • K(a);P-FLIGHT,P_SPINP(c)::QAB1(C),XB(b)
        • K(a);N_SPINB(b),P_SPINP(c),S_FLIGHT::QAR1(C),XB(b)
        • P(c);N_GUARD::QAR1(C),XB(b)
      • Refutation
        • K(a);N_SPINB(b),P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • P(c);::QAB1(C),XP(c)
      • Refutation
        • K(a);N_SPINB(b),P-FLIGHT,P_SPINP(c)
  • Actual
    • B(B);
    • Vars
      • K(a);N_SPINB(b),P-FLIGHT,P_SPINP(c)::QAB1(C),XB(b)
      • K(a);N_SPINB(b),OGATEB,P-FLIGHT,XB(B)::QAR(C)
      • K(a);N_SPINB(b),P_SPINP(c),S_FLIGHT::QAR1(C),XB(b)
      • P(c);N_GUARD::QAR1(C),XB(b)
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