MESON Chess Problem Database

Problem Display
PID: 17566 (4r1B1/3b2B1/3R1N2/prp1n2K/2P1P1p1/2kNQ3/PRpp4/3n4 w - - 0 1)

Stocchi, Ottavio

Problemi di Ottavio Stocchi, 1995

4r1B1/3b2B1/3R1N2/prp1n2K/2P1P1p1/2kNQ3/PRpp4/3n4

#2

11 + 11

3100 Selected Stocchi (I) 2001
56 The Problemist 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Rb3
      • 2.Rxb3#
    • 1...Sxd3
      • 2.Sxe8#
    • 1...Sxc4
      • 2.Sd5#
    • 1...c1S
      • 2.Qxd2#
    • 1...c1R
      • 2.Qxd2#
  • Tries
    • 1.Sb4+?
      • 1...Sxe3
        • 2.Rb3#
      • 1...Sd3
        • 2.Sxe8#
        • 2.Rb3#
      • 1...Kxb2!
    • 1.Sxc5+?
      • 1...Sxe3
        • 2.Sa4#
      • 1...Sd3
        • 2.Sxe8#
        • 2.Qd4#
      • 1...Kxb2!
  • Keys
    • 1.Qxc5!
      • threat
        • 2.Qd4#
      • 1...Rxc5
        • 2.Rb3#
      • 1...Sxd3
        • 2.Sd5#
      • 1...Sxc4
        • 2.Sxe8#
      • 1...Sf3
        • 2.cxb5#
      • 1...Sc6
        • 2.cxb5#
      • 1...Sg6
        • 2.cxb5#
      • 1...Sf7
        • 2.cxb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • R(g);N_GUARD::R1(B),XR(g)
    • S(i);P_SPINS(i),XS(C)::B(J)+S(I),XR(k)
    • S(i);SBLOCK,XP(E)::B(J)+S(I),DCHECK
    • P(b);::QAB1(D),XP(c)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • S(a);XQ(D)::R1(B)
      • Refutation
        • K(d);S_FLIGHT,XR(B)
    • Try
      • S(C);CHECK,XP(h)
      • Vars
        • S(a);XQ(D)::S(C)
      • Refutation
        • K(d);S_FLIGHT,XR(B)
  • Actual
    • Q(D);XP(h)
    • Threat
      • QAB1(D)
    • Vars
      • R(g);N_GUARD,XQ(D)::R1(B)
      • S(i);P_PINQ(D),SBLOCK,XS(C)::B(J)+S(I),DCHECK
      • S(i);P_PINQ(D),P_SPINS(i),XP(E)::B(J)+S(I),XR(k)
      • S(i);N_GUARD,P_PINQ(D)::QAR(D)+P(E),XR(g)
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