MESON Chess Problem Database

Problem Display
PID: 46522 (B1K5/b7/pkN1p3/4p3/4N3/1npQ4/P3p3/3b4 w - - 0 1)

Pilchenko, Viacheslav Karlovich

Shavirin, Valery Mikhailovich

3rd Prize, Moscow Ty., 1988

B1K5/b7/pkN1p3/4p3/4N3/1npQ4/P3p3/3b4

#2

6 + 9

4393 Uralski Problemist 2002
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...c2
      • 2.Qxb3#
  • Tries
    • 1.Sxc3?
      • threat
        • 2.Sa4#
      • 1...Kc5
        • 2.Sa4#
      • 1...Sa1
        • 2.Qe3#
      • 1...Sc1
        • 2.Qe3#
      • 1...Sd2
        • 2.Qe3#
      • 1...Sa5
        • 2.Qe3#
      • 1...Sc5
        • 2.Qd8#
      • 1...Sd4!
    • 1.Sf6?
      • threat
        • 2.Sd7#
      • 1...Kc5
        • 2.Sd7#
      • 1...Sc5!
    • 1.Bb7?
      • threat
        • 2.Qxa6#
      • 1...a5
        • 2.Qa6#
      • 1...Sc5!
    • 1.Qc4?
      • threat
        • 2.Qb4#
      • 1...Sd4
        • 2.Qc5#
      • 1...a5!
    • 1.a4?
      • threat
        • 2.Qd8#
      • 1...Sd4
        • 2.a5#
      • 1...a5
        • 2.Qb5#
      • 1...Bb8!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qb4#
      • 1...Kb5
        • 2.Qb4#
      • 1...a5
        • 2.Sd4#
      • 1...Sd4
        • 2.Qc5#
      • 1...Sc5
        • 2.Qxc5#

This anticipates 46531(1999)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • P(d);OGATE::QAR(B),XS(c)
  • Tries
    • Try
      • S(C);XP(d)
      • Threat
        • S(C)
      • Vars
        • K(g);S_FLIGHT::S(C)
        • S(c);N_GUARD::QAB(B)
        • S(c);SBLOCK::QAB(B)
      • Refutation
        • S(c);
    • Try
      • S(C);
      • Threat
        • S(C)
      • Vars
        • K(g);S_FLIGHT::S(C)
      • Refutation
        • S(c);
    • Try
      • B(E);
      • Threat
        • QAR1(B),XP(f)
      • Vars
        • P(f);::QAR1(B)
      • Refutation
        • S(c);
    • Try
      • Q(B);
      • Threat
        • QAR2(B)
      • Vars
        • S(c);N_GUARD::QAB1(B)
      • Refutation
        • P(f);
    • Try
      • P(A);
      • Threat
        • QAB(B)
      • Vars
        • S(c);N_GUARD::P(A)
        • P(f);N_GUARD::QAR1(B)
      • Refutation
        • B(i);
  • Actual
    • Q(B);
    • Threat
      • QAR2(B)
    • Vars
      • K(g);P-FLIGHT::QAR1(B)
      • P(f);SBLOCK::QAR(B)+S(D)
      • S(c);N_GUARD::QAB1(B)
      • S(c);N_GUARD::QAB1(B),XS(c)
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