MESON Chess Problem Database

Problem Display
PID: 261882 (4K3/8/p2p1R1n/Q2Pk3/7B/p1P4B/qN1r1N2/2b4b w - - 0 1)

Pirrone, Santi

2nd HM., L'Italia Scacchistica, 1975

4K3/8/p2p1R1n/Q2Pk3/7B/p1P4B/qN1r1N2/2b4b

#2

9 + 9

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Sc4#
    • 1...Qc4
      • 2.Sxc4#
    • 1...Qxd5
      • 2.Sc4#
    • 1...Qa1
      • 2.Sc4#
    • 1...Rc2
      • 2.Sbd3#
    • 1...Re2
      • 2.Sbd3#
    • 1...Rd3
      • 2.Sbxd3#
    • 1...Rxd5
      • 2.Sbd3#
    • 1...Sf5
      • 2.Rxf5#
    • 1...Sf7
      • 2.Rf5#
    • 1...Sg8
      • 2.Rf5#
  • Tries
    • 1.Qd8?
      • threat
        • 2.Qxd6#
      • 1...Kxd5
        • 2.Qxd6#
      • 1...Qxd5
        • 2.Bg3#
      • 1...Rxd5
        • 2.Qe7#
      • 1...Sf5
        • 2.Rxf5#
      • 1...Sf7
        • 2.Rf5#
      • 1...Rxf2!
    • 1.Qc5?
      • threat
        • 2.Qxd6#
      • 1...Qxd5
        • 2.Sc4#
      • 1...Rxf2
        • 2.Qd4#
      • 1...Rxd5
        • 2.Sbd3#
      • 1...Sf5
        • 2.Rxf5#
      • 1...Sf7
        • 2.Rf5#
      • 1...dxc5!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Qxd6#
      • 1...Kxd5
        • 2.Qxd6#
      • 1...Qxd5
        • 2.Qf4#
      • 1...Rxf2
        • 2.Qd4#
      • 1...Rxd5
        • 2.Re6#
      • 1...Sf5
        • 2.Rxf5#
      • 1...Sf7
        • 2.Rf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • Q(c);N_GUARD::S(A)
    • Q(c);N_GUARD::S(A),XQ(c)
    • Q(c);N_GUARD,P_SPINQ(c),XP(G)::S(A)
    • R(d);N_GUARD::S(A)
    • R(d);N_GUARD::S(A),XR(d)
    • R(d);N_GUARD,P_SPINR(d),XP(G)::S(A)
    • S(i);N_GUARD::R1(H),XS(i)
    • S(i);N_GUARD::R1(H)
  • Tries
    • Try
      • Q(F);
      • Threat
        • QAB1(F),XP(h)
      • Vars
        • K(f);P-FLIGHT,P_SPINP(h),XP(G)::QAR1(F),XP(h)
        • Q(c);SBLOCK,XP(G)::B(E)
        • R(d);SBLOCK,XP(G)::QAR2(F)
        • S(i);N_GUARD::R1(H),XS(i)
        • S(i);N_GUARD::R1(H)
      • Refutation
        • R(d);XS(B)
    • Try
      • Q(F);
      • Threat
        • QAB1(F),XP(h)
      • Vars
        • Q(c);N_GUARD,P_SPINQ(c),XP(G)::S(A)
        • R(d);N_GUARD,XS(B)::QAB1(F)
        • R(d);N_GUARD,P_SPINR(d),XP(G)::S(A)
        • S(i);N_GUARD::R1(H),XS(i)
        • S(i);N_GUARD::R1(H)
      • Refutation
        • P(h);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • QAB1(F),XP(h)
    • Vars
      • K(f);P-FLIGHT,XP(G)::QAR1(F),XP(h)
      • Q(c);SBLOCK,XP(G)::QAB1(F)
      • R(d);N_GUARD,XS(B)::QAB1(F)
      • R(d);SBLOCK,XP(G)::R1(H)
      • S(i);N_GUARD::R1(H),XS(i)
      • S(i);N_GUARD::R1(H)
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