MESON Chess Problem Database

Problem Display
PID: 90505 (3n4/b2B4/5pQ1/N1pk3K/R2Ppp2/p3Rp1N/2p4B/q7 w - - 0 1)

Stocchi, Ottavio

Die Schwalbe, 1953

3n4/b2B4/5pQ1/N1pk3K/R2Ppp2/p3Rp1N/2p4B/q7

#2

9 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...fxe3
      • 2.Qf5#
    • 1...f5
      • 2.Sxf4#
  • Tries
    • 1.Bxf4?
      • threat
        • 2.Qxe4#
        • 2.Qf5#
      • 1...cxd4
        • 2.Qf5#
      • 1...c4
        • 2.Qxe4#
      • 1...Bb8
        • 2.Qxe4#
      • 1...Sc6
        • 2.Qxe4#
        • 2.Qf7#
        • 2.Qg8#
      • 1...Sf7
        • 2.Qxe4#
        • 2.Qxf7#
      • 1...f5
        • 2.Qxf5#
        • 2.Qd6#
      • 1...Qxd4!
    • 1.Qf7+?
      • 1...Kd6
        • 2.Bxf4#
      • 1...Se6
        • 2.Qxe6#
      • 1...Sxf7!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Qxe4#
      • 1...Kxd4
        • 2.Qxe4#
      • 1...Qxd4
        • 2.Sxf4#
      • 1...fxe3
        • 2.Sxe3#
      • 1...cxd4
        • 2.Qf5#
      • 1...f5
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(f);XR(B)::QAR2(H)
    • P(i);::S(C),XP(f)
  • Tries
    • Try
      • B(A);XP(f)
      • Threat
        • DUALS(2)
      • Vars
        • P(g);XP(E)::QAR2(H)
        • P(g);::QAB1(H),XP(e)
        • B(j);::QAB1(H),XP(e)
      • Refutation
        • Q(a);XP(E)
    • Try
      • Q(H);CHECK
      • Vars
        • K(h);P-FLIGHT,P_SPINP(f)::B(A),XP(f)
        • S(k);N_GUARD,P_SPINS(k)::QAB1(H),XS(k)
      • Refutation
        • S(k);XQ(H)
  • Actual
    • S(F);
    • Threat
      • QAB1(H),XP(e)
    • Vars
      • K(h);P-FLIGHT,XP(E)::QAR1(H),XP(e)
      • Q(a);SBLOCK,XP(E)::S(C),XP(f)
      • P(f);XR(B)::S(F),XP(f)
      • P(g);SBLOCK,XP(E)::QAR2(H)
      • P(i);OGATE::QAR1(H)
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