MESON Chess Problem Database

Problem Display
PID: 235168 (4Q3/1n3Prn/7N/4p1P1/1Rb1Pk1B/2rp4/3P1N1K/3B4 w - - 0 1)

Erokhin, Vladimir Alekseevich

Schach, 1980

4Q3/1n3Prn/7N/4p1P1/1Rb1Pk1B/2rp4/3P1N1K/3B4

#2

11 + 8

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ba2
      • 2.Sh3#
    • 1...Bb3
      • 2.Sh3#
    • 1...Bb5
      • 2.Sh3#
    • 1...Bd5
      • 2.Sh3#
    • 1...Ba6
      • 2.Sh3#
    • 1...Bxf7
      • 2.Sh3#
    • 1...Sxg5
      • 2.Bg3#
  • Tries
    • 1.Rxc4?
      • threat
        • 2.Sh3#
      • 1...Sxg5
        • 2.Bg3#
      • 1...Rxc4!
    • 1.Qc6?
      • threat
        • 2.Sh3#
      • 1...Sxg5
        • 2.Bg3#
        • 2.Qf6#
      • 1...Be6!
    • 1.Qe7?
      • threat
        • 2.Bg3#
      • 1...Sf6
        • 2.Qxf6#
      • 1...Rxg5!
  • Keys
    • 1.Shg4!
      • threat
        • 2.Qxe5#
      • 1...Rxg5
        • 2.Bg3#
      • 1...Be6
        • 2.Sh3#

This anticipates 35207(1985)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • B(c);::S(C)
    • B(c);XP(J)::S(C)
    • S(h);SBLOCK,XP(H)::B(G)
  • Tries
    • Try
      • R(E);XB(c)
      • Threat
        • S(C)
      • Vars
        • S(h);SBLOCK,XP(H)::B(G)
      • Refutation
        • R(a);XR(E)
    • Try
      • Q(K);
      • Threat
        • S(C)
      • Refutation
        • B(c);
    • Try
      • Q(K);
      • Threat
        • B(G)
      • Vars
        • S(h);N_GUARD::QAR2(K),XS(h)
      • Refutation
        • R(g);XP(H)
  • Actual
    • S(I);
    • Threat
      • QAB1(K),XP(e)
    • Vars
      • R(g);SBLOCK,XP(H)::B(G)
      • B(c);::S(C)
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