MESON Chess Problem Database

Problem Display
PID: 85715 (8/8/4Q3/4R3/q7/1R6/2K5/k1B5 w - - 0 1)

Speckmann, Werner

Buletin Problemistic TT, 1987

8/8/4Q3/4R3/q7/1R6/2K5/k1B5

#2

5 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qb5
      • 2.Ra3#
    • 1...Qd7
      • 2.Rb1#
      • 2.Ra3#
    • 1...Qe8
      • 2.Rb1#
      • 2.Ra3#
    • 1...Qa3
      • 2.Rb1#
      • 2.Rxa3#
    • 1...Qd4
      • 2.Rb1#
      • 2.Ra3#
    • 1...Qf4
      • 2.Rb1#
      • 2.Ra3#
    • 1...Qg4
      • 2.Rb1#
      • 2.Ra3#
    • 1...Qh4
      • 2.Rb1#
      • 2.Ra3#
    • 1...Qa5
      • 2.Rb1#
      • 2.Rxa5#
    • 1...Qa6
      • 2.Rb1#
      • 2.Qxa6#
    • 1...Qa7
      • 2.Rb1#
    • 1...Qa8
      • 2.Rb1#
  • Tries
    • 1.Qa6?
      • threat
        • 2.Qxa4#
      • 1...Qa2+
        • 2.Bb2#
      • 1...Ka2
        • 2.Qxa4#
      • 1...Qa3
        • 2.Rxa3#
        • 2.Qxa3#
      • 1...Qa5
        • 2.Rxa5#
        • 2.Qxa5#
      • 1...Qxa6!
  • Keys
    • 1.Ra5!
      • threat
        • 2.Rxa4#
      • 1...Qa2+
        • 2.Bb2#
      • 1...Ka2
        • 2.Rxa4#
      • 1...Qxa5
        • 2.Rb1#
      • 1...Qa3
        • 2.Rb1#
        • 2.Rbxa3#
        • 2.Raxa3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(b);N_PINR(C)::R(C)
    • Q(b);N_PINR(C)::R1(C)
  • Tries
    • Try
      • Q(E);P_PINQ(b)
      • Threat
        • QAR(E),XQ(b)
      • Vars
        • Q(b);CHECK,N_PINR(C)::B(A)
        • K(a);P-FLIGHT::QAR2(E),XQ(b)
      • Refutation
        • Q(b);N_PINR(C),N_SPINQ(b),XQ(E)
  • Actual
    • R(D);P_PINQ(b)
    • Threat
      • R(D),XQ(b)
    • Vars
      • Q(b);CHECK,N_PINR(C)::B(A)
      • K(a);P-FLIGHT::R(D),XQ(b)
      • Q(b);N_PINR(C),N_SPINQ(b),XR(D)::R1(C)
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