MESON Chess Problem Database

Problem Display
PID: 15764 (q1nNB3/1pn1P3/1N5Q/r1k2p2/p1p5/P1B5/1R6/K5b1 w - - 0 1)

Shanshin, Valery Yurevich

1st Prize, Shakhmaty (Riga), 1987

q1nNB3/1pn1P3/1N5Q/r1k2p2/p1p5/P1B5/1R6/K5b1

#2

9 + 10

3297 FIDE Album (1986-1988) 1995
17121 Encyclopedia of Chess Problems (Velimirovic/Valtonen) 2012
133 The Problemist Supplement 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Bd4
      • 2.Bb4#
    • 1...Sd5
      • 2.Sd7#
  • Tries
    • 1.Bf7?
      • threat
        • 2.Sd7#
      • 1...Sxb6
        • 2.Qxb6#
      • 1...Se6!
    • 1.Rd2?
      • threat
        • 2.Bb4#
      • 1...Sxe8
        • 2.Rd5#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Rb5
        • 2.Sd7#
      • 1...Bd4
        • 2.Bxd4#
      • 1...Sd5
        • 2.Rxd5#
      • 1...Sa6
        • 2.Rd5#
      • 1...Se6!
    • 1.Qe3+?
      • 1...Kd6
        • 2.Sf7#
      • 1...Bxe3!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Sd7#
      • 1...Sxb6
        • 2.Bb4#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Sd5
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • B(a);SBLOCK::B(D)
    • S(h);SBLOCK::S(E)
  • Tries
    • Try
      • B(I);
      • Threat
        • S(E)
      • Vars
        • S(j);OGATE,XS(E)::QAB1(F),XS(j)
      • Refutation
        • S(h);
    • Try
      • R(B);
      • Threat
        • B(D)
      • Vars
        • S(h);N_GUARD,XB(I)::R1(B)
        • S(j);N_GUARD::QAB1(F),XS(j)
        • R(d);SBLOCK::S(E)
        • B(a);N_GUARD,P_PINB(D)::B(D),XB(a)
        • S(h);N_GUARD::R1(B),XS(h)
        • S(h);N_GUARD::R1(B)
      • Refutation
        • S(h);
    • Try
      • Q(F);CHECK
      • Vars
        • K(e);S_FLIGHT::S(H)
      • Refutation
        • B(a);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • S(E)
    • Vars
      • S(j);SBLOCK,XS(E)::B(D)
      • B(a);N_GUARD::QAB1(F),XB(a)
      • S(h);N_GUARD::QAR1(F),XS(h)
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