MESON Chess Problem Database

Problem Display
PID: 215704 (8/2RK1N2/1P2P3/rp6/1p1k4/1PN2Pp1/2P1p2q/2B1R2Q w - - 0 1)

Valle, Giovanni Batista

Reclam-Sammlung I, 1881

8/2RK1N2/1P2P3/rp6/1p1k4/1PN2Pp1/2P1p2q/2B1R2Q

#2

12 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Qxg1#
      • 2.Qh4#
      • 2.Qh8#
    • 1...Qf2
      • 2.Qh4#
      • 2.Qh8#
    • 1...Qg2
      • 2.Qh4#
      • 2.Qh8#
    • 1...Qh3
      • 2.Qg1#
    • 1...Qh4
      • 2.Qg1#
      • 2.Qxh4#
    • 1...Qh5
      • 2.Qg1#
    • 1...Qh7
      • 2.Qg1#
    • 1...Qh8
      • 2.Qg1#
      • 2.Qxh8#
  • Tries
    • 1.Sxe2+?
      • 1...Kd5
        • 2.Rd1#
      • 1...Qxe2!
    • 1.Rxe2?
      • threat
        • 2.Be3#
        • 2.Re4#
        • 2.Qd1#
      • 1...Qxh1
        • 2.Be3#
        • 2.Re4#
      • 1...bxc3
        • 2.Qd1#
      • 1...Qg1
        • 2.Re4#
        • 2.Qxg1#
        • 2.Qh4#
        • 2.Qh8#
      • 1...Qf2
        • 2.Re4#
        • 2.Qd1#
        • 2.Qh4#
        • 2.Qh8#
      • 1...Qh4
        • 2.Be3#
        • 2.Qd1#
        • 2.Qg1#
        • 2.Qxh4#
      • 1...Qh6
        • 2.Re4#
      • 1...Qh7
        • 2.Be3#
        • 2.Qg1#
      • 1...Qxe2!
  • Keys
    • 1.Kc6!
      • 1...Kxc3
        • 2.Kd5#
      • 1...Qxh1
        • 2.Sxe2#
      • 1...bxc3
        • 2.Rd7#
      • 1...Qg1
        • 2.Sxe2#
        • 2.Qh8#
      • 1...Qf2
        • 2.Qh8#
      • 1...Qg2
        • 2.Qh8#
      • 1...Qh3
        • 2.Sxe2#
      • 1...Qh4
        • 2.Sxe2#
      • 1...Qh5
        • 2.Sxe2#
      • 1...Qh6
        • 2.Sxe2#
      • 1...Qh7
        • 2.Sxe2#
      • 1...Qh8
        • 2.Sxe2#
        • 2.Qxh8#
      • 1...Ra1
        • 2.Sxb5#
      • 1...Ra2
        • 2.Sxb5#
      • 1...Ra3
        • 2.Sxb5#
      • 1...Ra4
        • 2.Sxb5#
      • 1...Ra6
        • 2.Sxb5#
      • 1...Ra7
        • 2.Sxb5#
      • 1...Ra8
        • 2.Sxb5#
      • 1...g2
        • 2.Sxe2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 3
    • ADDED MATES = 15
    • REMOVED MATES = 0
  • Sets
    • Q(b);N_GUARD,P_PINP(I)::QAB(C)
    • Q(b);N_GUARD::QAB(C)
    • Q(b);N_GUARD,P_PINS(L)::QAB(C)
  • Tries
    • Try
      • S(F);CHECK,XP(a)
      • Vars
        • K(e);P-FLIGHT::R(B)
      • Refutation
        • Q(b);XS(F)
    • Try
      • R(B);XP(a)
      • Threat
        • DUALS(3)
      • Vars
        • P(d);XS(F)::QAR(C)
        • Q(b);::R1(B)
      • Refutation
        • Q(b);XR(B)
  • Actual
    • K(K);S_FLIGHT
    • Vars
      • K(e);S_FLIGHT,XS(F)::R(J)+K(K)
      • Q(b);N_GUARD,P_PINP(G),XQ(C)::S(F),XP(a)
      • P(d);SBLOCK,XS(F)::R(J)
      • Q(b);OGATE::QAB(C)
      • Q(b);OGATE,P_PINP(G)::QAB(C)
      • Q(b);N_GUARD::S(F),XP(a)
      • Q(b);N_GUARD,P_PINP(I)::S(F),XP(a)
      • R(f);N_GUARD::S(F),XP(g)
      • R(f);N_GUARD,P_PINP(H)::S(F),XP(g)
      • P(c);S_CUTQ(b)::S(F),XP(a)
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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).