MESON Chess Problem Database

Problem Display
PID: 17662 (N7/3p4/2pPpP2/2kbR3/r1P1p3/Pp2N3/3Q4/2R3BK w - - 0 1)

Stocchi, Ottavio

1st Prize, Parallele 50 03. TT, 1948

N7/3p4/2pPpP2/2kbR3/r1P1p3/Pp2N3/3Q4/2R3BK

#2

11 + 8

113 Shakhmaty v SSSR 1949
3207 A R Gooderson An English Progressive 1996
3100 Selected Stocchi (I) 2001
133 The Problemist Supplement 2008
136 Problem Observer 2014

SOLUTION

  • SOUND
  • Tries
    • 1.Sg4+?
      • 1...Kxd6
        • 2.c5#
      • 1...e3+!
    • 1.Sxd5+?
      • 1...e3
        • 2.Sxe3#
        • 2.Sb4#
        • 2.Sf4#
        • 2.Sdb6#
        • 2.Sdc7#
        • 2.Se7#
      • 1...Kxd6!
    • 1.Qd4+?
      • 1...Kxd6
        • 2.c5#
      • 1...Kxd4!
  • Keys
    • 1.Rxe4!
      • threat
        • 2.Sf5#
      • 1...Bxe4+
        • 2.Sg2#
      • 1...Kxd6
        • 2.c5#
      • 1...Rxc4
        • 2.Qb4#
      • 1...Bxc4
        • 2.Re5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(d);OGATE,S_FLIGHT,XP(I)::P(G)
      • Refutation
        • P(c);CHECK,P_SPINP(c)
    • Try
      • S(F);CHECK,XB(e)
      • Refutation
        • K(d);S_FLIGHT,XP(I)
    • Try
      • Q(D);CHECK
      • Vars
        • K(d);OGATE,S_FLIGHT,XP(I)::P(G)
      • Refutation
        • K(d);N_SPINB(e),S_FLIGHT,XQ(D)
  • Actual
    • R(H);N_PINB(e),P_SPINR(H),XP(c)
    • Threat
      • B(B)+S(F)
    • Vars
      • B(e);CHECK,XR(H)::B(B)+S(F)
      • K(d);OGATE,P_SPINB(e),S_FLIGHT,XP(I)::P(G)
      • R(b);N_GUARD,P_SPINR(b),XP(G)::QAB1(D)
      • B(e);N_PINR(H),P_SPINB(e),XP(G)::R(H)
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