MESON Chess Problem Database

Problem Display
PID: 240299 (8/r7/8/7B/2R4K/1p6/k7/2Q5 w - - 0 1)

Lincoln, Robert A

Problem-Forum, 2015

8/r7/8/7B/2R4K/1p6/k7/2Q5

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Rxa4#
    • 1...Rb7
      • 2.Ra4#
    • 1...Rc7
      • 2.Ra4#
    • 1...Rd7
      • 2.Ra4#
    • 1...Re7
      • 2.Ra4#
    • 1...Rf7
      • 2.Ra4#
    • 1...Rg7
      • 2.Ra4#
    • 1...Rh7
      • 2.Ra4#
  • Tries
    • 1.Rc2+?
      • 1...b2
        • 2.Qxb2#
      • 1...bxc2!
    • 1.Qb1+?
      • 1...Ka3
        • 2.Qa1#
      • 1...Kxb1!
  • Keys
    • 1.Bf7!
      • threat
        • 2.Rc2#
      • 1...Rxf7
        • 2.Ra4#
      • 1...b2
        • 2.Ra4#
      • 1...Ra4
        • 2.Rxa4#
      • 1...Rc7
        • 2.Ra4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • R(c);N_GUARD,P_PINR(B)::R(B),XR(c)
    • R(c);N_GUARD::R(B)
    • R(c);N_GUARD,P_PINB(D)::R(B)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • P(b);P_SPINP(b)::QAR1(A),XP(b)
      • Refutation
        • P(b);XR(B)
    • Try
      • Q(A);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • K(a);S_FLIGHT,XQ(A)
  • Actual
    • B(D);
    • Threat
      • R(B)
    • Vars
      • R(c);N_GUARD,XB(D)::R(B)
      • P(b);::B(D)+R(B),DCHECK
      • R(c);N_GUARD,P_PINR(B)::R(B),XR(c)
      • R(c);N_GUARD::R(B)
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