MESON Chess Problem Database

Problem Display
PID: 104872 (3N2B1/2p5/8/1PBN1p1n/1P2kP2/R2p2r1/K7/1n3Q2 w - - 0 1)

St Maurice, Ephrem

La Presse, 1932

3N2B1/2p5/8/1PBN1p1n/1P2kP2/R2p2r1/K7/1n3Q2

#2

10 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1
      • 2.Qxd3#
    • 1...Rg2+
      • 2.Qxg2#
    • 1...Rg4
      • 2.Qxd3#
    • 1...Rg5
      • 2.Qxd3#
    • 1...Rg6
      • 2.Qxd3#
    • 1...Rg7
      • 2.Qxd3#
    • 1...Rxg8
      • 2.Qxd3#
    • 1...Sd2
      • 2.Sc3#
    • 1...Sxa3
      • 2.Sc3#
    • 1...Sc3+
      • 2.Sxc3#
    • 1...Sxf4
      • 2.Qxf4#
    • 1...Sf6
      • 2.Sxf6#
    • 1...Sg7
      • 2.Sf6#
    • 1...d2
      • 2.Qc4#
  • Tries
    • 1.Kxb1?
      • threat
        • 2.Sc3#
      • 1...Sxf4
        • 2.Qxf4#
      • 1...d2
        • 2.Qc4#
      • 1...Rf3!
    • 1.Qe2+?
      • 1...Re3
        • 2.Qxe3#
      • 1...dxe2!
    • 1.Qe1+?
      • 1...Re3
        • 2.Qxe3#
      • 1...Kf3!
    • 1.Qh1+?
      • 1...Rg2+
        • 2.Qxg2#
      • 1...Rf3!
  • Keys
    • 1.Sf7!
      • 1...Rg2+
        • 2.Qxg2#
      • 1...Sc3+
        • 2.Sxc3#
      • 1...Kxd5
        • 2.Sg5#
      • 1...Rxg8
        • 2.Qxd3#
      • 1...Sxa3
        • 2.Sc3#
      • 1...Sxf4
        • 2.Sf6#
      • 1...Rf3
        • 2.Sg5#
      • 1...Rg1
        • 2.Qxd3#
      • 1...Re3
        • 2.Sg5#
      • 1...Rh3
        • 2.Sg5#
      • 1...Rg4
        • 2.Qxd3#
      • 1...Rg5
        • 2.Sxg5#
        • 2.Qxd3#
      • 1...Rg6
        • 2.Qxd3#
      • 1...Rg7
        • 2.Qxd3#
      • 1...Sd2
        • 2.Sc3#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sg7
        • 2.Sf6#
      • 1...d2
        • 2.Qc4#
      • 1...c6
        • 2.Sd6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • R(c);N_GUARD::QAB1(A),XP(b)
    • R(c);CHECK,N_GUARD::QAB(A),XR(c)
    • R(c);N_GUARD,XB(J)::QAB1(A),XP(b)
    • S(a);N_GUARD::S(H)
    • S(a);N_GUARD,XR(C)::S(H)
    • S(a);CHECK,N_GUARD::S(H),XS(a)
    • S(f);OGATE,XP(E)::QAR1(A),XS(f)
    • S(f);N_GUARD::S(H),XS(f)
    • S(f);N_GUARD::S(H)
    • P(b);OGATE::QAR2(A)
  • Tries
    • Try
      • K(B);S_FLIGHT,XS(a)
      • Threat
        • S(H)
      • Vars
        • S(f);OGATE,XP(E)::QAR1(A),XS(f)
        • P(b);OGATE::QAR2(A)
      • Refutation
        • R(c);
    • Try
      • Q(A);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAR1(A),XR(c)
      • Refutation
        • P(b);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAR1(A),XR(c)
      • Refutation
        • K(d);P_SPINP(b),S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • R(c);CHECK,N_GUARD,P_SPINR(c)::QAB(A),XR(c)
      • Refutation
        • R(c);P_SPINR(c)
  • Actual
    • S(I);
    • Vars
      • R(c);CHECK,N_GUARD::QAB(A),XR(c)
      • S(a);CHECK,N_GUARD::S(H),XS(a)
      • K(d);S_FLIGHT,XS(H)::B(J)+S(I)
      • R(c);N_GUARD,XB(J)::QAB1(A),XP(b)
      • S(a);N_GUARD,XR(C)::S(H)
      • S(f);N_GUARD,XP(E)::S(H)
      • R(c);N_GUARD::S(I)
      • R(c);N_GUARD::QAB1(A),XP(b)
      • S(a);N_GUARD::S(H)
      • S(f);N_GUARD::S(H),XS(f)
      • S(f);N_GUARD::S(H)
      • P(b);OGATE::QAR2(A)
      • P(g);N_GUARD::S(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).