MESON Chess Problem Database

Problem Display
PID: 85665 (R2N4/2KB4/8/2p5/2p1k3/3Rp3/4Q1nB/2b2N2 w - - 0 1)

Shifrin, Semion

Problemesis, 2004

R2N4/2KB4/8/2p5/2p1k3/3Rp3/4Q1nB/2b2N2

#2

8 + 6

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bb2
      • 2.Sd2#
    • 1...Bd2
      • 2.Sxd2#
    • 1...Ba3
      • 2.Sd2#
  • Tries
    • 1.Sf7?
      • threat
        • 2.Sg5#
        • 2.Sd6#
        • 2.Re8#
      • 1...Bb2
        • 2.Sd2#
        • 2.Sg5#
        • 2.Sd6#
      • 1...Sf4
        • 2.Sg3#
      • 1...cxd3!
    • 1.Rd2?
      • threat
        • 2.Qxg2#
      • 1...Sf4
        • 2.Qxe3#
      • 1...Se1
        • 2.Qg4#
        • 2.Qxe3#
      • 1...Sh4
        • 2.Qg4#
        • 2.Qxe3#
      • 1...Bxd2!
    • 1.Rd6?
      • threat
        • 2.Qxg2#
      • 1...Se1
        • 2.Qg4#
      • 1...Sh4
        • 2.Qg4#
      • 1...Sf4!
    • 1.Ra4?
      • threat
        • 2.Rxc4#
      • 1...Bb2
        • 2.Sd2#
      • 1...Sf4!
  • Keys
    • 1.Sc6!
      • threat
        • 2.Re8#
      • 1...cxd3
        • 2.Qxg2#
      • 1...Bb2
        • 2.Sd2#
      • 1...Sf4
        • 2.Sg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::S(A)
    • B(a);N_GUARD::S(A),XB(a)
  • Tries
    • Try
      • S(H);
      • Threat
        • DUALS(3)
      • Vars
        • S(b);SBLOCK::S(A)
      • Refutation
        • P(d);XR(D)
    • Try
      • R(D);
      • Threat
        • QAB(B),XS(b)
      • Vars
        • S(b);N_GUARD::QAR1(B),XP(c)
      • Refutation
        • B(a);XR(D)
    • Try
      • R(D);
      • Threat
        • QAB(B),XS(b)
      • Vars
        • S(b);N_GUARD::QAR2(B)
      • Refutation
        • S(b);
    • Try
      • R(G);
      • Threat
        • R(G),XP(d)
      • Vars
        • B(a);N_GUARD::S(A)
      • Refutation
        • S(b);
  • Actual
    • S(H);
    • Threat
      • R(G)
    • Vars
      • P(d);SBLOCK,XR(D)::QAB(B),XS(b)
      • B(a);N_GUARD::S(A)
      • S(b);SBLOCK::S(A)
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