MESON Chess Problem Database

Problem Display
PID: 229109 (3Q4/4np1K/rr3N2/2PPkPB1/2R5/1p1B4/7b/3b2n1 w - - 0 1)

Gulyaev, Aleksandr Pavlovich (aka Grin, AP)

Shakhmaty, 1926

3Q4/4np1K/rr3N2/2PPkPB1/2R5/1p1B4/7b/3b2n1

#2

9 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bc2
      • 2.Sg4#
    • 1...Bg4
      • 2.Sxg4#
    • 1...Se2
      • 2.Sg4#
    • 1...Sf3
      • 2.Sg4#
    • 1...Sxd5
      • 2.Sd7#
      • 2.Qxd5#
    • 1...Sxf5
      • 2.Re4#
    • 1...Sc6
      • 2.Qc7#
      • 2.Qd6#
  • Tries
    • 1.Bf4+?
      • 1...Kxf6
        • 2.Qh8#
      • 1...Bxf4!
  • Keys
    • 1.Bd2!
      • threat
        • 2.Bc3#
      • 1...Kxf6
        • 2.Qh8#
      • 1...Sxd5
        • 2.Sd7#
      • 1...Sxf5
        • 2.Re4#
      • 1...Se2
        • 2.Sg4#
      • 1...Sf3
        • 2.Sg4#
      • 1...Sc6
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::S(G)
    • B(a);N_GUARD::S(G),XB(a)
    • S(b);S_CUTB(a)::S(G)
    • S(h);SBLOCK,XP(E)::R1(B)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • K(e);P_SPINS(h),S_FLIGHT,XS(G)::QAB(I)
      • Refutation
        • B(c);XB(F)
  • Actual
    • B(F);
    • Threat
      • B(F)
    • Vars
      • K(e);OGATEB,P_SPINS(h),S_FLIGHT,XS(G)::QAB(I)
      • S(h);SBLOCK,XP(D)::S(G)
      • S(h);SBLOCK,XP(E)::R1(B)
      • S(b);S_CUTB(a)::S(G)
      • S(h);S_CUTR(g)::QAB1(I)
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