MESON Chess Problem Database

Problem Display
PID: 157823 (2B1Q3/r2Np3/p3k1pn/Kn2N1q1/1B1pPb2/p1p5/8/8 w - - 0 1)

Bottacchi, Antonio

5th Prize, L'Alfiere di Re, 1924

2B1Q3/r2Np3/p3k1pn/Kn2N1q1/1B1pPb2/p1p5/8/8

#2

7 + 12

4901 Best Problems 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Qxe7#
    • 1...Qg2
      • 2.Qxe7#
    • 1...Qg3
      • 2.Qxe7#
    • 1...Qg4
      • 2.Qxe7#
    • 1...Qxe5
      • 2.Qxe7#
    • 1...Qf5
      • 2.Qxe7#
    • 1...Qh5
      • 2.Qxe7#
    • 1...Sg4
      • 2.Qf7#
      • 2.Qg8#
    • 1...Sf5
      • 2.Qf7#
      • 2.Qg8#
    • 1...Sf7
      • 2.Qxf7#
    • 1...Sg8
      • 2.Qf7#
      • 2.Qxg8#
  • Tries
    • 1.Sf6+?
      • 1...Kxf6
        • 2.Qh8#
      • 1...Rd7
        • 2.Qxe7#
      • 1...Kxe5!
    • 1.Qg8+?
      • 1...Sf7
        • 2.Qxf7#
      • 1...Sxg8!
  • Keys
    • 1.Sg4!
      • threat
        • 2.Sf8#
      • 1...Bc7+
        • 2.Sb6#
      • 1...Sd6+
        • 2.Sc5#
      • 1...Sc7+
        • 2.Sde5#
      • 1...Qxg4
        • 2.Qxe7#
      • 1...Rxd7
        • 2.Bxd7#
      • 1...Sxg4
        • 2.Qg8#
      • 1...Qc5
        • 2.Qxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 7
  • Sets
    • Q(f);N_GUARD::QAR1(G),XP(l)
    • Q(f);N_GUARD,XS(D)::QAR1(G),XP(l)
    • S(j);N_GUARD::QAB1(G),XS(j)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(h);N_SPINP(l),P-FLIGHT,XS(E)::QAB(G)
        • R(k);P_SPINR(k)::QAR1(G),XP(l)
      • Refutation
        • K(h);P-FLIGHT,XS(D)
    • Try
      • Q(G);CHECK,N_PINP(l)
      • Vars
        • S(j);N_GUARD,P_SPINS(j)::QAB1(G),XS(j)
      • Refutation
        • S(j);XQ(G)
  • Actual
    • S(D);
    • Threat
      • B(F)+S(E),DCHECK
    • Vars
      • B(d);CHECK,S_CUTR(k)::B(F)+S(E)
      • S(e);CHECK,SBLOCK::B(F)+S(E),DCHECK
      • S(e);CHECK,S_CUTR(k)::B(F)+S(E)
      • Q(f);N_GUARD,XS(D)::QAR1(G),XP(l)
      • R(k);OGATE,P_SPINR(k),XS(E)::B(F),XR(k)
      • S(j);N_GUARD,XS(D)::QAB(G)
      • Q(f);N_GUARD::QAR2(G),XP(i)
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Developed and maintained by Brian Stephenson.
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