MESON Chess Problem Database

Problem Display
PID: 180413 (8/8/8/1PPP3R/Q1K1k1p1/1NP3p1/3P1nP1/5R2 w - - 0 1)

Lider, Valentin Viktorovich

Comm., Pravda Vostoka, 1975

8/8/8/1PPP3R/Q1K1k1p1/1NP3p1/3P1nP1/5R2

#2

11 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Sa1?
      • 1...Kf4
        • 2.Kb3#
      • 1...Sd1
        • 2.Qc2#
      • 1...Sh1
        • 2.Qc2#
      • 1...Sh3
        • 2.Qc2#
      • 1...Sd3!
    • 1.Sc1?
      • threat
        • 2.Kb3#
      • 1...Kf4
        • 2.Kb3#
      • 1...Sd3!
    • 1.Sa5?
      • 1...Kf4
        • 2.Kb3#
      • 1...Sd1
        • 2.Qc2#
      • 1...Sh1
        • 2.Qc2#
      • 1...Sh3
        • 2.Qc2#
      • 1...Sd3!
    • 1.Qa6?
      • 1...Sd3
        • 2.Qg6#
      • 1...Sd1
        • 2.Qe6#
        • 2.Qg6#
      • 1...Sh1
        • 2.Qe6#
        • 2.Qg6#
      • 1...Sh3
        • 2.Qe6#
        • 2.Qg6#
      • 1...Kf4!
    • 1.Qa7?
      • 1...Sd3
        • 2.Qh7#
      • 1...Sd1
        • 2.Qe7#
        • 2.Qh7#
      • 1...Sh1
        • 2.Qe7#
        • 2.Qh7#
      • 1...Sh3
        • 2.Qe7#
        • 2.Qh7#
      • 1...Kf4!
    • 1.Qa8?
      • 1...Sd3
        • 2.d6#
      • 1...Sd1
        • 2.Qe8#
        • 2.d6#
      • 1...Sh1
        • 2.Qe8#
        • 2.d6#
      • 1...Sh3
        • 2.Qe8#
        • 2.d6#
      • 1...Kf4!
    • 1.b6?
      • 1...Kf4
        • 2.Kb5#
      • 1...Sd1
        • 2.Qe8#
      • 1...Sh1
        • 2.Qe8#
      • 1...Sh3
        • 2.Qe8#
      • 1...Sd3!
    • 1.c6?
      • 1...Kf4
        • 2.Kc5#
      • 1...Sd1
        • 2.Sc5#
      • 1...Sh1
        • 2.Sc5#
      • 1...Sh3
        • 2.Sc5#
      • 1...Sd3!
  • Keys
    • 1.d6!
      • 1...Kf4
        • 2.Kd5#
      • 1...Sd3
        • 2.Qa8#
      • 1...Sd1
        • 2.Qa8#
      • 1...Sh1
        • 2.Qa8#
      • 1...Sh3
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(D);
      • Vars
        • K(c);P-FLIGHT,P_SPINS(a)::QAR(F)+K(G)
        • S(a);N_GUARD::QAB(F)
      • Refutation
        • S(a);
    • Try
      • S(D);
      • Threat
        • QAR(F)+K(G)
      • Vars
        • K(c);P-FLIGHT,P_SPINS(a)::QAR(F)+K(G)
      • Refutation
        • S(a);
    • Try
      • S(D);
      • Vars
        • K(c);P-FLIGHT,P_SPINS(a)::QAR(F)+K(G)
        • S(a);N_GUARD::QAB(F)
      • Refutation
        • S(a);
    • Try
      • Q(F);
      • Vars
        • S(a);::QAB(F)
      • Refutation
        • K(c);P-FLIGHT,P_SPINS(a)
    • Try
      • Q(F);
      • Vars
        • S(a);::QAB(F)
      • Refutation
        • K(c);P-FLIGHT,P_SPINS(a)
    • Try
      • Q(F);
      • Vars
        • S(a);::QAB(F)+P(J)
      • Refutation
        • K(c);P-FLIGHT,P_SPINS(a)
    • Try
      • P(H);
      • Vars
        • K(c);P-FLIGHT,P_SPINS(a)::QAR(F)+K(G)
        • S(a);::QAR(F)
      • Refutation
        • S(a);
    • Try
      • P(I);
      • Vars
        • K(c);P-FLIGHT,P_SPINS(a)::QAR(F)+K(G)
        • S(a);::S(D)
      • Refutation
        • S(a);
  • Actual
    • P(J);
    • Vars
      • K(c);P-FLIGHT,P_SPINS(a)::QAR(F)+K(G)
      • S(a);::QAB(F)
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