MESON Chess Problem Database

Problem Display
PID: 173987 (b2Q4/3p3r/1P1k2p1/N1p1n1R1/3n2p1/N3p3/B1P5/1KbR1q2 w - - 0 1)

Bottacchi, Antonio

L'Italia Scacchistica, 1920

b2Q4/3p3r/1P1k2p1/N1p1n1R1/3n2p1/N3p3/B1P5/1KbR1q2

#2

9 + 12

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qe2
      • 2.Qf6#
    • 1...Qg2
      • 2.Sb5#
      • 2.Qf6#
    • 1...Qh3
      • 2.Sb5#
      • 2.Qf6#
    • 1...Qb5+
      • 2.Sxb5#
    • 1...Qa6
      • 2.Qf6#
    • 1...Qe1
      • 2.Sb5#
      • 2.Qf6#
    • 1...Qg1
      • 2.Sb5#
      • 2.Qf6#
    • 1...Qh1
      • 2.Sb5#
      • 2.Qf6#
    • 1...Qf2
      • 2.Sb5#
    • 1...Qf3
      • 2.Sb5#
    • 1...Qf4
      • 2.Sb5#
    • 1...Qf5
      • 2.Sb5#
    • 1...Qf6
      • 2.Sb5#
      • 2.Qxf6#
    • 1...Qf7
      • 2.Sb5#
    • 1...Qf8
      • 2.Sb5#
    • 1...Re7
      • 2.Qc7#
      • 2.Qb8#
    • 1...Bf3
      • 2.Qf6#
    • 1...Sf3
      • 2.Qf6#
    • 1...Sf7
      • 2.Qf8#
    • 1...e2
      • 2.Sb5#
  • Tries
    • 1.Sb7+?
      • 1...Kc6
        • 2.Qc7#
      • 1...Bxb7!
    • 1.Rxg6+?
      • 1...Qf6
        • 2.Sb5#
        • 2.Rxf6#
        • 2.Qxf6#
      • 1...Sxg6!
    • 1.Qf8+?
      • 1...Re7
        • 2.Qb8#
      • 1...Qxf8!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qxe5#
      • 1...Qb5+
        • 2.Sxb5#
      • 1...Qf4
        • 2.Sb5#
      • 1...Qf5
        • 2.Sb5#
      • 1...Qf6
        • 2.Sb5#
      • 1...Re7
        • 2.Qb8#
      • 1...Sd3
        • 2.S3c4#
      • 1...Sf3
        • 2.Rxg6#
      • 1...Sc4
        • 2.Sb5#
      • 1...Sc6
        • 2.Rd5#
      • 1...Sf7
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • Q(b);N_GUARD::QAR2(I)
    • Q(b);CHECK,N_GUARD::S(E),XQ(b)
    • Q(b);N_GUARD::S(E)
    • Q(b);N_GUARD,P_PINP(D)::S(E)
    • B(l);S_CUTQ(b)::QAR2(I)
    • S(g);S_CUTQ(b)::QAR2(I)
    • S(g);S_CUTQ(b),S_CUTR(k)::QAB(I)
    • P(c);S_CUTQ(b)::S(E)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(h);N_SPINP(j),N_SPINS(d),P-FLIGHT::QAR1(I)
      • Refutation
        • B(l);XS(F)
    • Try
      • R(G);CHECK,XP(i)
      • Refutation
        • S(g);XR(G)
    • Try
      • Q(I);CHECK,N_PINP(j)
      • Vars
        • R(k);P_SPINR(k),SBLOCK::QAB(I)
      • Refutation
        • Q(b);XQ(I)
  • Actual
    • Q(I);N_PINP(j)
    • Threat
      • QAB1(I),XS(g)
    • Vars
      • Q(b);CHECK,N_GUARD::S(E),XQ(b)
      • Q(b);N_GUARD::S(E)
      • Q(b);N_GUARD,P_PINP(D)::S(E)
      • R(k);SBLOCK::QAB(I)
      • S(g);N_GUARD,N_SPINS(d),S_CUTQ(b)::S(E)
      • S(g);N_GUARD,S_CUTQ(b)::R(G),XP(i)
      • S(g);S_CUTQ(b)::S(E)
      • S(g);OGATE::R1(G)
      • S(g);S_CUTQ(b),S_CUTR(k)::QAB(I)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).