MESON Chess Problem Database

Problem Display
PID: 246078 (8/8/8/knK4Q/1pB5/8/1R6/8 w - - 0 1)

Zinoviev, Nikolai

Problemist Pribuzhya, 1990

8/8/8/knK4Q/1pB5/8/1R6/8

#2

4 + 3

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sd4
      • 2.Ra2#
    • 1...Sd6
      • 2.Ra2#
    • 1...Sa7
      • 2.Ra2#
    • 1...Sc7
      • 2.Ra2#
  • Tries
    • 1.Kc6?
      • threat
        • 2.Ra2#
        • 2.Qxb5#
      • 1...Ka6
        • 2.Ra2#
      • 1...b3
        • 2.Qxb5#
      • 1...Ka4!
    • 1.Qg6?
      • 1...Ka4
        • 2.Qa6#
      • 1...Sa3
        • 2.Qa6#
      • 1...Sc3
        • 2.Qa6#
      • 1...Sd4
        • 2.Ra2#
        • 2.Qa6#
      • 1...Sd6
        • 2.Ra2#
      • 1...Sa7
        • 2.Ra2#
        • 2.Qa6#
      • 1...Sc7
        • 2.Ra2#
      • 1...b3!
    • 1.Qh6?
      • 1...Ka4
        • 2.Qa6#
      • 1...Sa3
        • 2.Qa6#
      • 1...Sc3
        • 2.Qa6#
      • 1...Sd4
        • 2.Ra2#
        • 2.Qa6#
      • 1...Sd6
        • 2.Ra2#
      • 1...Sa7
        • 2.Ra2#
        • 2.Qa6#
      • 1...Sc7
        • 2.Ra2#
      • 1...b3!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qxb5#
      • 1...Ka4
        • 2.Ra2#
      • 1...Ka6
        • 2.Qa8#
      • 1...Sa3
        • 2.Qa8#
      • 1...Sc3
        • 2.Qa8#
      • 1...Sd4
        • 2.Ra2#
        • 2.Qa8#
      • 1...Sd6
        • 2.Ra2#
        • 2.Qa8#
      • 1...Sa7
        • 2.Ra2#
      • 1...Sc7
        • 2.Ra2#

Anticipated by 157598(1982)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • S(c);N_GUARD::R(A)
  • Tries
    • Try
      • K(C);P-FLIGHT,P_PINS(c)
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::R(A)
        • P(a);::QAR1(D),XS(c)
      • Refutation
        • K(b);N_SPINS(c),P-FLIGHT
    • Try
      • Q(D);
      • Vars
        • K(b);P-FLIGHT::QAR2(D)
        • S(c);::QAR1(D)
        • S(c);N_GUARD::R(A)
      • Refutation
        • P(a);
    • Try
      • Q(D);
      • Vars
        • K(b);P-FLIGHT::QAR2(D)
        • S(c);::QAR1(D)
        • S(c);N_GUARD::R(A)
      • Refutation
        • P(a);
  • Actual
    • Q(D);
    • Threat
      • QAR1(D),XS(c)
    • Vars
      • K(b);P-FLIGHT,P_SPINS(c)::R(A)
      • K(b);P-FLIGHT,P_SPINS(c)::QAR2(D)
      • S(c);N_GUARD::QAR(D)
      • S(c);N_GUARD::R(A)
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