MESON Chess Problem Database

Problem Display
PID: 179679 (8/2p5/ppp5/1k1pQ3/3R4/1N1P4/KN1P4/1R1B4 w - - 0 1)

Kondratiev, Vissarion

Kopnin, Aleksey Grigorevich

1/2 HM., Pravda Vostoka, 1975

8/2p5/ppp5/1k1pQ3/3R4/1N1P4/KN1P4/1R1B4

#2

9 + 6

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Tries
    • 1.Sa4?
      • threat
        • 2.Sc3#
      • 1...a5
        • 2.Sbc5#
      • 1...c5!
    • 1.Sc4?
      • threat
        • 2.Sa3#
      • 1...Ka4
        • 2.Sa1#
        • 2.Sc1#
        • 2.Sba5#
        • 2.Sc5#
        • 2.Sa3#
        • 2.Sd6#
      • 1...Kb4
        • 2.Sa3#
        • 2.Sd6#
      • 1...c5
        • 2.Sba5#
      • 1...a5!
    • 1.Sc5?
      • 1...Kxc5
        • 2.Sa4#
      • 1...bxc5
        • 2.Sc4#
      • 1...a5
        • 2.Sba4#
      • 1...Ka5!
    • 1.Qxc7?
      • 1...c5
        • 2.Qd7#
      • 1...a5!
  • Keys
    • 1.Sa5!
      • 1...Kxa5
        • 2.Sc4#
      • 1...Kc5
        • 2.Sa4#
      • 1...bxa5
        • 2.Sa4#
      • 1...c5
        • 2.Sbc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(D);
      • Threat
        • S(D)
      • Vars
        • P(c);SBLOCK::R(A)+S(F)
      • Refutation
        • P(e);N_SPINP(b)
    • Try
      • S(D);
      • Threat
        • S(D)
      • Vars
        • P(e);N_SPINP(b),SBLOCK::R(A)+S(F)
      • Refutation
        • P(c);
    • Try
      • S(F);N_PINP(b)
      • Vars
        • K(a);P-FLIGHT,P_SPINP(b),XS(F)::S(D)
        • P(d);SBLOCK,XS(F)::R(A)+S(D)
        • P(c);SBLOCK::R(A)+S(D)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(I);N_PINP(b),XP(f)
      • Vars
        • P(e);OGATEB::QAB(I)
      • Refutation
        • P(c);
  • Actual
    • S(F);
    • Vars
      • K(a);P-FLIGHT,XS(F)::S(D)
      • K(a);P-FLIGHT::S(D)
      • P(d);SBLOCK,XS(F)::R(A)+S(D)
      • P(e);N_SPINP(b),SBLOCK::R(A)+S(D)
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