MESON Chess Problem Database

Problem Display
PID: 197154 (2Qn4/5R2/rR1nP3/1p1k4/p2B2b1/b3pP2/4N2K/1B6 w - - 0 1)

Pereira, Alvaro

The Problemist, 2018

2Qn4/5R2/rR1nP3/1p1k4/p2B2b1/b3pP2/4N2K/1B6

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sc4
      • 2.Be4#
    • 1...Se4
      • 2.Ba2#
      • 2.Bxe4#
      • 2.fxe4#
    • 1...Sf5
      • 2.Ba2#
      • 2.Be4#
    • 1...S6b7
      • 2.Ba2#
      • 2.Be4#
    • 1...S6xf7
      • 2.Ba2#
      • 2.Be4#
    • 1...Sxc8
      • 2.Ba2#
    • 1...Se8
      • 2.Ba2#
      • 2.Be4#
    • 1...Sxe6
      • 2.Qc6#
  • Tries
    • 1.Rxb5+?
      • 1...Bc5
        • 2.Rxc5#
      • 1...Sxb5!
    • 1.Rxd6+?
      • 1...Kxd6
        • 2.Qd7#
      • 1...Rxd6
        • 2.Ba2#
        • 2.Be4#
      • 1...Bxd6+!
    • 1.Rf5+?
      • 1...Sxf5
        • 2.Ba2#
        • 2.Be4#
      • 1...Bxf5!
    • 1.Rd7?
      • threat
        • 2.Ba2#
      • 1...Kxe6
        • 2.Sf4#
      • 1...b4
        • 2.Rdxd6#
      • 1...Bxf3!
    • 1.Qc5+?
      • 1...Kxe6
        • 2.Ba2#
      • 1...Bxc5!
    • 1.Qc6+?
      • 1...Kxe6
        • 2.Ba2#
      • 1...Sxc6!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Sf4#
      • 1...Kxe6
        • 2.Ba2#
      • 1...Sxe6
        • 2.Qc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • S(h);N_GUARD::B(A)
    • S(h);N_GUARD,XQ(I)::B(A)
    • S(i);N_GUARD,SBLOCK,XP(G)::QAB1(I)
  • Tries
    • Try
      • R(F);CHECK,XP(e)
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::R1(F),XB(a)
      • Refutation
        • S(h);XR(F)
    • Try
      • R(F);CHECK,XS(h)
      • Vars
        • K(f);P-FLIGHT,XR(F)::QAR1(I)
      • Refutation
        • B(a);CHECK,XR(F)
    • Try
      • R(H);CHECK
      • Refutation
        • B(d);XR(H)
    • Try
      • R(H);P_PINS(h)
      • Threat
        • B(A)
      • Vars
        • K(f);S_FLIGHT,XP(G)::S(B)
        • P(e);S_CUTB(a)::R1(H),XS(h)
      • Refutation
        • B(d);XP(D)
    • Try
      • Q(I);CHECK
      • Vars
        • K(f);P_SPINS(h),S_FLIGHT,XP(G)::B(A)
      • Refutation
        • B(a);XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • K(f);P_SPINS(h),S_FLIGHT,XP(G)::B(A)
      • Refutation
        • S(i);XQ(I)
  • Actual
    • Q(I);
    • Threat
      • S(B)
    • Vars
      • K(f);P_SPINS(h),S_FLIGHT,XP(G)::B(A)
      • S(i);N_GUARD,SBLOCK,XP(G)::QAB1(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).