MESON Chess Problem Database

Problem Display
PID: 177924 (8/3pq3/3p1p2/4b2Q/2p2r2/P1k1BN1R/3RKp2/N3nr2 w - - 0 1)

Fokin, Yuri Georgievich

Sahs (Latvia), 1987

8/3pq3/3p1p2/4b2Q/2p2r2/P1k1BN1R/3RKp2/N3nr2

#2

8 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bd4
      • 2.Qa5#
    • 1...Sc2
      • 2.Rxc2#
    • 1...Sg2
      • 2.Rc2#
    • 1...Sd3
      • 2.Rc2#
    • 1...Sxf3
      • 2.Rc2#
  • Tries
    • 1.Sg5?
      • threat
        • 2.Bd4#
      • 1...Rf3
        • 2.Se4#
      • 1...Rd4
        • 2.Bxd4#
      • 1...Re4
        • 2.Sxe4#
      • 1...Sd3
        • 2.Rc2#
      • 1...Sf3
        • 2.Rc2#
      • 1...Bd4!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Sb5#
      • 1...Rxd4
        • 2.Bxd4#
      • 1...Bxd4
        • 2.Qa5#
      • 1...Sc2
        • 2.Rxc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • B(g);OGATE,P_PINB(E)::QAB(H)
    • S(a);N_GUARD::R1(B),XS(a)
    • S(a);N_GUARD::R1(B)
    • S(a);N_GUARD,XS(F)::R1(B)
  • Tries
    • Try
      • S(F);
      • Threat
        • R(G)+B(E),DCHECK
      • Vars
        • R(f);N_GUARD::S(F)
        • R(f);::R(G)+B(E),DCHECK,XR(f)
        • R(f);N_GUARD,P_PINB(E)::S(F),XR(f)
        • S(a);N_GUARD::R1(B)
      • Refutation
        • B(g);P_PINB(E)
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • R(f);OGATE,XS(F)::R(G)+B(E),DCHECK,XR(f)
      • B(g);OGATE,P_PINB(E),XS(F)::QAB(H)
      • S(a);N_GUARD::R1(B),XS(a)
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