MESON Chess Problem Database

Problem Display
PID: 180448 (Q1N5/8/1N1P4/pkB2R2/1b1P4/1n6/2R5/7K w - - 0 1)

Lider, Valentin Viktorovich

Thema Danicum, 1987

Q1N5/8/1N1P4/pkB2R2/1b1P4/1n6/2R5/7K

#2

9 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...a4
      • 2.Qxa4#
  • Tries
    • 1.Qc6+?
      • 1...Ka6
        • 2.Sa4#
        • 2.Sc4#
        • 2.Sd5#
        • 2.Sd7#
        • 2.Sa8#
      • 1...Kxc6!
    • 1.Qb7?
      • threat
        • 2.Sa7#
      • 1...a4
        • 2.Sc4#
      • 1...Bxc5!
    • 1.Qa6+?
      • 1...Kc6
        • 2.Sa7#
        • 2.Se7#
        • 2.d5#
      • 1...Kxa6!
  • Keys
    • 1.Rb2!
      • 1...Bxc5
        • 2.Rxb3#
      • 1...Sxd4
        • 2.Bxd4#
      • 1...Sxc5
        • 2.Rxc5#
      • 1...Be1
        • 2.Ba3#
      • 1...Bd2
        • 2.Ba3#
      • 1...Ba3
        • 2.Bxa3#
      • 1...Bc3
        • 2.Ba3#
      • 1...Sa1
        • 2.Bxb4#
      • 1...Sc1
        • 2.Bxb4#
      • 1...Sd2
        • 2.Bxb4#
      • 1...a4
        • 2.Qxa4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 10
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATE::QAB1(H),XP(c)
  • Tries
    • Try
      • Q(H);CHECK
      • Refutation
        • K(d);S_FLIGHT,XQ(H)
    • Try
      • Q(H);
      • Threat
        • S(I)
      • Vars
        • P(c);SBLOCK::QAR(H)+S(F)
      • Refutation
        • B(b);P_SPINB(b),XB(D)
    • Try
      • Q(H);CHECK
      • Refutation
        • K(d);S_FLIGHT,XQ(H)
  • Actual
    • R(B);
    • Vars
      • B(b);OGATEB,P_SPINB(b),P_SPINS(a),XB(D)::R(B),XS(a)
      • S(a);OGATE,P_SPINB(b),XP(C)::R(E)+B(D),XS(a)
      • S(a);OGATE,P_SPINB(b),P_SPINS(a),XB(D)::R1(E),XS(a)
      • B(b);OGATE,P_SPINS(a)::R(E)+B(D)
      • B(b);OGATE,P_SPINS(a)::R(E)+B(D),XB(b)
      • S(a);N_GUARD,P_SPINB(b)::R(E)+B(D),XB(b)
      • P(c);OGATE::QAB1(H),XP(c)
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