MESON Chess Problem Database

Problem Display
PID: 239809 (3R1B2/n3r1N1/R2N2p1/3k2K1/2qrp3/P2pP3/B4Q2/8 w - - 0 1)

Cristoffanini, Guido

L'Italia Scacchistica, 1938

3R1B2/n3r1N1/R2N2p1/3k2K1/2qrp3/P2pP3/B4Q2/8

#2

10 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Re5+
      • 2.Sdf5#
    • 1...Rf7
      • 2.Sxf7#
    • 1...Rxg7
      • 2.Sf7#
  • Tries
    • 1.Sxc4+?
      • 1...Rd7
        • 2.Rxd7#
        • 2.Qf7#
      • 1...Kc5!
    • 1.Sxe4+?
      • 1...Kxe4
        • 2.Qf4#
      • 1...Ke5
        • 2.Qf4#
      • 1...Rd7!
    • 1.Sb7+?
      • 1...Ke5
        • 2.Qg3#
        • 2.Qh2#
        • 2.Qf4#
        • 2.Qf6#
      • 1...Rd7!
    • 1.Sf7+?
      • 1...Rd7
        • 2.Rxd7#
      • 1...Kc5!
    • 1.Bxc4+?
      • 1...Kc5
        • 2.exd4#
      • 1...Ke5
        • 2.Qg3#
        • 2.Qh2#
        • 2.Qf4#
        • 2.Qf6#
        • 2.exd4#
      • 1...Rxc4!
    • 1.Qf5+?
      • 1...Re5
        • 2.Sxc4#
        • 2.Sxe4#
        • 2.Sb5#
        • 2.Sb7#
        • 2.Sf7#
        • 2.Sc8#
        • 2.Sde8#
      • 1...gxf5!
  • Keys
    • 1.Qb2!
      • threat
        • 2.Qxd4#
      • 1...Re5+
        • 2.Sdf5#
      • 1...Kc5
        • 2.Sb7#
      • 1...Ke5
        • 2.Sxc4#
      • 1...Rxg7
        • 2.Sf7#
      • 1...Sb5
        • 2.Qxb5#
      • 1...Sc6
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(h);CHECK,N_GUARD,SBLOCK::R(I)+S(G)
    • R(h);N_GUARD::R(I)+S(G),XR(h)
    • R(h);N_GUARD,XS(H)::R(I)+S(G)
  • Tries
    • Try
      • S(G);CHECK,XQ(b)
      • Refutation
        • K(e);P-FLIGHT,P_SPINR(h)
    • Try
      • S(G);CHECK,XP(d)
      • Vars
        • K(e);N_SPINQ(b),S_FLIGHT,XS(G)::QAR1(B)
        • K(e);N_SPINQ(b),P-FLIGHT::QAB1(B)
      • Refutation
        • R(h);P_SPINR(h)
    • Try
      • S(G);CHECK
      • Refutation
        • R(h);P_SPINR(h)
    • Try
      • S(G);CHECK
      • Vars
        • R(h);N_GUARD,P_SPINR(h)::R(I),XR(h)
      • Refutation
        • K(e);N_SPINQ(b),P-FLIGHT,P_SPINR(h)
    • Try
      • B(A);CHECK,XQ(b)
      • Vars
        • K(e);P-FLIGHT::P(D),XR(c)
      • Refutation
        • R(c);XB(A)
    • Try
      • Q(B);CHECK
      • Refutation
        • P(f);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAR1(B),XR(c)
    • Vars
      • R(h);CHECK,N_GUARD,SBLOCK::R(I)+S(G)
      • K(e);N_SPINQ(b),P-FLIGHT::S(G)
      • K(e);N_SPINQ(b),P-FLIGHT,P_SPINR(c)::S(G),XQ(b)
      • R(h);N_GUARD,XS(H)::R(I)+S(G)
      • S(g);N_GUARD::QAR2(B),XS(g)
      • S(g);N_GUARD::QAR2(B)
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