MESON Chess Problem Database

Problem Display
PID: 29924 (4R3/8/r1pB2K1/p2Npp2/1Ppk4/2p3N1/Q5bb/1BR2nr1 w - - 0 1)

Stocchi, Ottavio

3rd Prize, Xeque!, 1948

4R3/8/r1pB2K1/p2Npp2/1Ppk4/2p3N1/Q5bb/1BR2nr1

#2

9 + 12

70 American Chess Problemist 1949
3100 Selected Stocchi (I) 2001

SOLUTION

  • SOUND
  • Sets
    • 1...Bxd5
      • 2.Bc5#
    • 1...cxd5
      • 2.Sxf5#
  • Tries
    • 1.Sxc3?
      • threat
        • 2.Sxf5#
        • 2.Bc5#
      • 1...Bxg3
        • 2.Bc5#
      • 1...Sxg3
        • 2.Bc5#
        • 2.Qd2#
        • 2.Qf2#
      • 1...axb4
        • 2.Sxf5#
      • 1...Bh1
        • 2.Bc5#
      • 1...Bf3
        • 2.Bc5#
      • 1...Bh3
        • 2.Bc5#
      • 1...Be4
        • 2.Bc5#
      • 1...Bd5
        • 2.Bc5#
      • 1...Se3
        • 2.Sge2#
        • 2.Bc5#
        • 2.Bxe5#
        • 2.Qd2#
      • 1...f4
        • 2.Sf5#
        • 2.Bc5#
      • 1...c5
        • 2.Sxf5#
      • 1...Ke3!
    • 1.Qf2+?
      • 1...Kxd5
        • 2.Qc5#
      • 1...Se3!
  • Keys
    • 1.Rxc3!
      • threat
        • 2.Qxc4#
      • 1...Kxd5
        • 2.Rd3#
      • 1...Bxd5
        • 2.Bxe5#
      • 1...cxd5
        • 2.Se2#
      • 1...Sd2
        • 2.Qxd2#
      • 1...Se3
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(c);P_PINS(D),SBLOCK,XS(F)::B(G)
    • P(l);P_PINB(G),SBLOCK,XS(F)::S(D),XP(j)
  • Tries
    • Try
      • S(F);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • B(d);XS(D)::B(G)
        • P(h);XP(E)::S(D),XP(j)
        • B(c);P_PINS(D)::B(G)
        • P(l);P_PINB(G)::S(D),XP(j)
      • Refutation
        • K(g);P_SPINP(i),S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(g);OGATE,P-FLIGHT,XS(F)::QAR1(C)
      • Refutation
        • S(a);P_SPINS(a)
  • Actual
    • R(B);XP(e)
    • Threat
      • QAR1(C),XP(f)
    • Vars
      • K(g);P-FLIGHT,P_SPINP(f),XS(F)::R(B)
      • B(c);P_PINS(D),SBLOCK,XS(F)::B(G),XP(i)
      • P(l);P_PINB(G),SBLOCK,XS(F)::S(D)
      • S(a);N_GUARD::QAR2(C),XS(a)
      • S(a);N_GUARD::QAR2(C)
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