MESON Chess Problem Database

Problem Display
PID: 238905 (1r2r3/2n5/7B/2RN1p1K/n2N1Rp1/3k4/3p1p2/1b1Qb2B w - - 0 1)

Petite, Efren

Il Due Mosse, 1957

1r2r3/2n5/7B/2RN1p1K/n2N1Rp1/3k4/3p1p2/1b1Qb2B

#2

8 + 11

15148 Sadier Collection 2021
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Qxb1#
    • 1...Rbc8
      • 2.Qxb1#
    • 1...Rbd8
      • 2.Qxb1#
    • 1...Re2
      • 2.Qxe2#
    • 1...Rec8
      • 2.Qe2#
    • 1...Red8
      • 2.Qe2#
    • 1...Rf8
      • 2.Qe2#
    • 1...Rg8
      • 2.Qe2#
    • 1...Rh8
      • 2.Qe2#
    • 1...Ba2
      • 2.Qc2#
    • 1...Bc2
      • 2.Qxc2#
    • 1...Sb2
      • 2.Rc3#
      • 2.Qxb1#
    • 1...Sc3
      • 2.Rxc3#
    • 1...Sb6
      • 2.Rc3#
      • 2.Qb3#
      • 2.Qxb1#
    • 1...Sb5
      • 2.Qxb1#
    • 1...Se6
      • 2.Qe2#
  • Tries
    • 1.Sc6?
      • threat
        • 2.Rd4#
      • 1...Rb4
        • 2.Scxb4#
      • 1...Sb5
        • 2.Scb4#
      • 1...Se6
        • 2.Se5#
      • 1...Re4!
    • 1.Sb4+?
      • 1...Ke3
        • 2.Re4#
        • 2.Qe2#
      • 1...Rxb4!
    • 1.Qb3+?
      • 1...Sc3
        • 2.Rxc3#
        • 2.Qc4#
        • 2.Qxc3#
      • 1...Rxb3!
    • 1.Qf3+?
      • 1...Re3
        • 2.Qxe3#
      • 1...gxf3!
  • Keys
    • 1.Sxf5!
      • threat
        • 2.Rd4#
      • 1...Re4
        • 2.Bxe4#
      • 1...Rb4
        • 2.Sxb4#
      • 1...Sb5
        • 2.Sb4#
      • 1...Se6
        • 2.Be4#

This anticipates 179255(2010)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 12
  • Sets
    • R(j);N_GUARD::QAB(A),XB(a)
    • R(k);N_GUARD::QAB1(A),XR(k)
    • R(k);N_GUARD::QAB1(A)
    • R(k);N_GUARD,P_PINB(H)::QAB1(A)
    • B(a);N_GUARD::QAB1(A)
    • B(a);N_GUARD::QAB1(A),XB(a)
    • S(f);N_GUARD::R1(E),XS(f)
    • S(i);S_CUTR(j)::QAB(A),XB(a)
    • S(i);S_CUTR(k)::QAB1(A)
  • Tries
    • Try
      • S(C);
      • Threat
        • R1(D)
      • Vars
        • R(j);N_GUARD::S(C),XR(j)
        • S(i);S_CUTR(j)::S(C)
        • S(i);S_CUTR(k)::S(C)
      • Refutation
        • R(k);
    • Try
      • S(F);CHECK
      • Refutation
        • R(j);XS(F)
    • Try
      • Q(A);CHECK,N_PINP(c)
      • Refutation
        • R(j);XQ(A)
    • Try
      • Q(A);CHECK,N_PINP(c)
      • Vars
        • R(k);N_GUARD,P_SPINR(k)::QAR1(A),XR(k)
      • Refutation
        • P(g);XQ(A)
  • Actual
    • S(C);XP(h)
    • Threat
      • R1(D)
    • Vars
      • R(k);N_GUARD::B(B),XR(k)
      • R(j);N_GUARD::S(F),XR(j)
      • S(i);S_CUTR(j)::S(F)
      • S(i);S_CUTR(k)::B(B)
HTML5 logo

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).