MESON Chess Problem Database

Problem Display
PID: 147066 (6BK/5r1p/4R3/2NR4/8/p7/kP2p3/2Q5 w - - 0 1)

Lincoln, Robert A

Australian Chess Problem Magazine, 1996

6BK/5r1p/4R3/2NR4/8/p7/kP2p3/2Q5

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...axb2
      • 2.Ra6#
  • Tries
    • 1.Rxe2?
      • threat
        • 2.bxa3#
        • 2.b3#
        • 2.b4#
      • 1...axb2
        • 2.Qxb2#
      • 1...Rf2
        • 2.Rf5#
      • 1...Rb7
        • 2.b3#
        • 2.b4#
      • 1...Re7!
    • 1.Re3?
      • threat
        • 2.Rxa3#
      • 1...Rf3
        • 2.Rf5#
      • 1...Ra7
        • 2.Rd7#
      • 1...axb2!
    • 1.Ra6?
      • threat
        • 2.Rxa3#
      • 1...Ra7
        • 2.Rd7#
      • 1...Rf3!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Rxa3#
      • 1...axb2
        • 2.Ra6#
      • 1...Rf3
        • 2.Rf6#
      • 1...Ra7
        • 2.Re7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATEB,XP(B)::R(E)
  • Tries
    • Try
      • R(E);XP(b)
      • Threat
        • DUALS(3)
      • Vars
        • P(c);OGATE,P_SPINP(c),XP(B)::QAR1(A),XP(c)
        • R(d);OGATEB::B(F)+R(D)
      • Refutation
        • R(d);
    • Try
      • R(E);
      • Threat
        • R1(E),XP(c)
      • Vars
        • R(d);OGATEB::B(F)+R(D)
      • Refutation
        • P(c);XP(B)
    • Try
      • R(E);P_PINP(c)
      • Threat
        • R1(E),XP(c)
      • Vars
        • R(d);OGATEB::B(F)+R(D)
      • Refutation
        • R(d);
  • Actual
    • R(D);
    • Threat
      • R1(D),XP(c)
    • Vars
      • P(c);OGATEB,XP(B)::R(E)
      • R(d);OGATEB::B(F)+R(E)
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