MESON Chess Problem Database

Problem Display
PID: 239489 (2R3r1/1K1R3P/2N5/1p1pP3/1Pk5/Q2ppP2/Pb1q4/n7 w - - 0 1)

Groeneveld, Cornelis

Magyar Sakkelet, 1961

2R3r1/1K1R3P/2N5/1p1pP3/1Pk5/Q2ppP2/Pb1q4/n7

#2

10 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb4
      • 2.Qxb4#
    • 1...Bd4
      • 2.Sa5#
    • 1...Sc2
      • 2.Qb3#
    • 1...Sb3
      • 2.Qxb3#
    • 1...d4
      • 2.Sa5#
      • 2.Sd8#
      • 2.hxg8Q#
      • 2.hxg8B#
  • Tries
    • 1.Se7+?
      • 1...Kd4
        • 2.Rxd5#
      • 1...Rxc8!
    • 1.Qa7?
      • threat
        • 2.Qc5#
      • 1...Kc3
        • 2.Qc5#
      • 1...Qxb4
        • 2.Sa5#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Sb3!
    • 1.hxg8Q?
      • threat
        • 2.Qxd5#
      • 1...Sb3
        • 2.Qxb3#
      • 1...Bxa3!
    • 1.hxg8B?
      • threat
        • 2.Bxd5#
      • 1...Qxb4
        • 2.Qxb4#
      • 1...Sb3
        • 2.Qxb3#
      • 1...Bxa3!
  • Keys
    • 1.Rxd5!
      • threat
        • 2.Rc5#
      • 1...Rg7+
        • 2.Se7#
      • 1...Kxd5
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...Qxb4
        • 2.Qxd3#
      • 1...Sb3
        • 2.Qxb3#
      • 1...Bd4
        • 2.Rxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • Q(c);OGATE,XP(D)::QAR1(B),XQ(c)
    • B(b);SBLOCK::R(J)+S(F),DCHECK
    • S(a);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(f);P-FLIGHT,P_SPINP(h)::R1(H),XP(h)
      • Refutation
        • R(i);XR(J)
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • K(f);P-FLIGHT::QAR2(B)
        • Q(c);SBLOCK,XP(D)::R(J)+S(F),DCHECK
        • B(b);N_GUARD::QAR1(B),XB(b)
      • Refutation
        • S(a);
    • Try
      • P(I);P_PINP(h),XR(i)
      • Threat
        • QAB1(I),XP(h)
      • Vars
        • S(a);N_GUARD::QAB1(B),XS(a)
      • Refutation
        • B(b);XQ(B)
    • Try
      • P(I);P_PINP(h),XR(i)
      • Threat
        • B(I),XP(h)
      • Vars
        • Q(c);OGATE,XP(D)::QAR1(B),XQ(c)
        • S(a);N_GUARD::QAB1(B),XS(a)
      • Refutation
        • B(b);XQ(B)
  • Actual
    • R(H);XP(h)
    • Threat
      • R1(H)
    • Vars
      • R(i);CHECK,N_GUARD::R(J)+S(F)
      • K(f);S_FLIGHT,XR(H)::PXR(i)=Q
      • Q(c);N_GUARD,XP(D)::QAB1(B),XP(d)
      • S(a);N_GUARD::QAB1(B),XS(a)
      • B(b);N_GUARD::R1(H),XB(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).