MESON Chess Problem Database

Problem Display
PID: 157384 (2R4B/8/2b2n2/K1P5/1pk1nQ1r/1N2P1p1/2P2p2/bN1R3B w - - 0 1)

Petite, Efren

Arbejder-Skak, 1954

2R4B/8/2b2n2/K1P5/1pk1nQ1r/1N2P1p1/2P2p2/bN1R3B

#2

11 + 9

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Bd4
      • 2.Rxd4#
    • 1...Bd5
      • 2.S3d2#
    • 1...Sd5
      • 2.S1d2#
    • 1...f1Q
      • 2.Qxf1#
    • 1...f1S
      • 2.Qxf1#
    • 1...f1B
      • 2.Qxf1#
    • 1...f1R
      • 2.Qxf1#
  • Tries
    • 1.S1d2+?
      • 1...Kd5
        • 2.Qd6#
      • 1...Kc3!
    • 1.Sa3+?
      • 1...Kc3
        • 2.Qe5#
      • 1...bxa3!
    • 1.S3d2+?
      • 1...Kd5
        • 2.Qd6#
      • 1...Kxc5!
    • 1.Bg2?
      • threat
        • 2.Bf1#
      • 1...Bd4
        • 2.Rxd4#
      • 1...f1Q
        • 2.Bxf1#
        • 2.Qxf1#
      • 1...f1S
        • 2.Bxf1#
        • 2.Qxf1#
      • 1...f1B
        • 2.Bxf1#
        • 2.Qxf1#
      • 1...f1R
        • 2.Bxf1#
        • 2.Qxf1#
      • 1...Rh1!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Qe2#
      • 1...Sxc5
        • 2.S3d2#
      • 1...Bd4
        • 2.Rxd4#
      • 1...f1Q
        • 2.Qxf1#
      • 1...f1B
        • 2.Qxf1#
      • 1...Sc3
        • 2.S1d2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • B(a);N_GUARD,N_SPINS(f)::R1(B),XB(a)
    • B(h);SBLOCK::S(E)
    • S(i);SBLOCK::S(A)
    • P(b);OGATE::QAB(G),XQ(b)
    • P(b);OGATE::QAB(G),XS(b)
    • P(b);OGATE::QAB(G),XB(b)
    • P(b);OGATE::QAB(G),XR(b)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(e);S_FLIGHT::QAR1(G)
      • Refutation
        • K(e);N_SPINS(f),P-FLIGHT,P_SPINS(i)
    • Try
      • S(A);CHECK
      • Vars
        • K(e);N_SPINS(f),P-FLIGHT,P_SPINS(i)::QAB(G)
      • Refutation
        • P(d);XS(A)
    • Try
      • S(E);CHECK
      • Vars
        • K(e);S_FLIGHT::QAR1(G)
      • Refutation
        • K(e);N_SPINS(f),P-FLIGHT,P_SPINB(h),XP(I)
    • Try
      • B(C);
      • Threat
        • B(C)
      • Vars
        • B(a);N_GUARD,N_SPINS(f)::R1(B),XB(a)
      • Refutation
        • R(g);
  • Actual
    • Q(G);N_PINS(f)
    • Threat
      • QAB(G)
    • Vars
      • S(f);N_GUARD,SBLOCK,XP(I)::S(E)
      • B(a);N_GUARD::R1(B),XB(a)
      • P(b);OGATE::QAB(G),XQ(b)
      • P(b);OGATE::QAB(G),XB(b)
      • S(f);N_GUARD,SBLOCK::S(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).