MESON Chess Problem Database

Problem Display
PID: 264661 (3N1Q1K/2pP4/bqp1BP1p/4k2n/3pN1R1/4PP2/8/5rb1 w - - 0 1)

Pilchenko, Viacheslav Karlovich

Shavirin, Valery Mikhailovich

1/2 Prize, ChessStar, 2018

(First published on Wed Dec 5 2018)

3N1Q1K/2pP4/bqp1BP1p/4k2n/3pN1R1/4PP2/8/5rb1

#2

10 + 10

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5
      • 2.Qxc5#
    • 1...Qb1
      • 2.Qc5#
    • 1...Qb2
      • 2.Qc5#
    • 1...Qb7
      • 2.Qc5#
    • 1...Qb8
      • 2.Qc5#
    • 1...Sf4
      • 2.exf4#
    • 1...Sxf6
      • 2.Qxf6#
  • Tries
    • 1.Sc5?
      • threat
        • 2.Re4#
      • 1...Sxf6
        • 2.Sf7#
      • 1...Qb1
        • 2.Sxc6#
      • 1...Bd3
        • 2.Sxd3#
      • 1...Sf4
        • 2.exf4#
      • 1...Sg3!
    • 1.Qe7?
      • threat
        • 2.Sf7#
      • 1...Qb8
        • 2.Qc5#
      • 1...dxe3!
    • 1.Qe8?
      • threat
        • 2.Sf7#
        • 2.Qxh5#
      • 1...Rxf3
        • 2.Sf7#
      • 1...Bxe3
        • 2.Sf7#
      • 1...Sxf6
        • 2.Sf7#
      • 1...Sg3
        • 2.Sf7#
      • 1...Sf4
        • 2.Sf7#
        • 2.exf4#
      • 1...Sg7
        • 2.Sf7#
      • 1...dxe3!
  • Keys
    • 1.Sf2!
      • threat
        • 2.Re4#
      • 1...Sxf6
        • 2.f4#
      • 1...Qb1
        • 2.exd4#
      • 1...Bd3
        • 2.Sxd3#
      • 1...Sg3
        • 2.f4#
      • 1...Sf4
        • 2.exf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(g);N_GUARD::QAR2(I),XQ(g)
    • Q(g);N_GUARD::QAR2(I)
    • S(e);OGATE::P(A),XS(e)
    • S(e);OGATE,XP(F)::QAB1(I),XS(e)
  • Tries
    • Try
      • S(C);
      • Threat
        • R1(D)
      • Vars
        • S(e);SBLOCK,XP(F)::S(H)
        • Q(g);N_GUARD::S(H),XP(h)
        • B(f);N_GUARD::S(C),XB(f)
        • S(e);OGATE::P(A),XS(e)
      • Refutation
        • S(e);
    • Try
      • Q(I);
      • Threat
        • S(H)
      • Vars
        • Q(g);N_GUARD,P_PINS(H)::QAR2(I)
      • Refutation
        • P(c);XP(A)
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);XP(B)::S(H)
        • B(b);XP(A)::S(H)
        • S(e);XP(F)::S(H)
        • S(e);::S(H)
      • Refutation
        • P(c);XP(A)
  • Actual
    • S(C);
    • Threat
      • R1(D)
    • Vars
      • S(e);N_GUARD,XP(F)::P(B)
      • Q(g);N_GUARD::P(A),XP(c)
      • B(f);N_GUARD::S(C),XB(f)
      • S(e);N_GUARD::P(B)
      • S(e);OGATE::P(A),XS(e)
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