MESON Chess Problem Database

Problem Display
PID: 138056 (1B1qr3/bprn1N2/4npp1/RB3k2/2R5/4p2P/Q1N5/2K5 w - - 0 1)

Gugel, Lev Nikolaevich

HM., 64 Shakhmatnoe obozrenie, 1931

1B1qr3/bprn1N2/4npp1/RB3k2/2R5/4p2P/Q1N5/2K5

#2

9 + 11

14752 Soviet Chess Compositions (1945-1947) 1949
14868 Pirnie Collection 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.Sxe3#
    • 1...Bxb8
      • 2.Sxe3#
    • 1...Sf4
      • 2.Bxd7#
    • 1...Sg5
      • 2.Bxd7#
    • 1...Sg7
      • 2.Bxd7#
    • 1...Sef8
      • 2.Bxd7#
    • 1...Sc5
      • 2.Sxe3#
    • 1...Sb6
      • 2.Sxe3#
    • 1...b6
      • 2.Sxe3#
  • Tries
    • 1.Bxd7+?
      • 1...Rc5
        • 2.Sxe3#
        • 2.Rf4#
      • 1...Bc5
        • 2.Sxe3#
      • 1...b5!
    • 1.Rf4+?
      • 1...Sxf4
        • 2.Bd3#
      • 1...Kxf4!
  • Keys
    • 1.Rg4!
      • threat
        • 2.Bd3#
      • 1...Rxc2+
        • 2.Qxc2#
      • 1...Sec5
        • 2.Sd4#
      • 1...Rc4
        • 2.Sh6#
      • 1...Sdc5
        • 2.Sxe3#
      • 1...Se5
        • 2.Sh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 8
  • Sets
    • R(h);S_CUTB(f)::S(C),XP(a)
    • B(f);N_GUARD,XB(I)::S(C),XP(a)
    • S(c);::R(F)+B(G),DCHECK,XS(i)
    • S(i);S_CUTB(f)::S(C),XP(a)
    • P(g);S_CUTB(f)::S(C),XP(a)
  • Tries
    • Try
      • B(G);CHECK,P_PINS(c),XS(i)
      • Vars
        • B(f);P_SPINB(f)::S(C),XP(a)
      • Refutation
        • P(g);P_SPINP(g)
    • Try
      • R(E);CHECK,P_SPINS(C)
      • Vars
        • S(c);SBLOCK,XR(E)::R(F)+B(G),DCHECK
      • Refutation
        • K(b);P-FLIGHT,P_SPINR(h),XR(E)
  • Actual
    • R(E);P_SPINS(C)
    • Threat
      • R(F)+B(G),DCHECK
    • Vars
      • R(h);CHECK,OGATE,XS(C)::QAB(B),XR(h)
      • S(c);N_PINS(C)::S(C)
      • R(h);::S(H)
      • S(i);N_PINS(C)::S(C),XP(a)
      • S(i);SBLOCK::S(H)
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