MESON Chess Problem Database

Problem Display
PID: 203305 (B1nr1N2/p1p1np2/3k4/r1N3BK/1P4Pp/8/3pQ2b/2RRq3 w - - 0 1)

Nagy, Odon

2nd Prize, Gyeri Sakkor, 1924

B1nr1N2/p1p1np2/3k4/r1N3BK/1P4Pp/8/3pQ2b/2RRq3

#2

10 + 12

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd1
      • 2.Qxh2#
    • 1...Rxc5
      • 2.bxc5#
    • 1...Bg1
      • 2.Bf4#
    • 1...Bf4
      • 2.Bxf4#
    • 1...Be5
      • 2.Se4#
    • 1...Sd5
      • 2.Sb7#
    • 1...Sb6
      • 2.Bxe7#
  • Tries
    • 1.Rxd2+?
      • 1...Sd5
        • 2.Sb7#
        • 2.Rxd5#
      • 1...Qxd2!
    • 1.Qd3+?
      • 1...Sd5
        • 2.Qxd5#
      • 1...Ke5!
    • 1.Qxd2+?
      • 1...Ke5
        • 2.Rxe1#
        • 2.Qxe1#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Qxd2!
    • 1.Qxh2+?
      • 1...Qe5
        • 2.Se4#
      • 1...Qg3!
  • Keys
    • 1.Bxd2!
      • threat
        • 2.Bf4#
      • 1...Rxc5+
        • 2.bxc5#
      • 1...Qxd2
        • 2.Qxh2#
      • 1...Qxd1
        • 2.Qxh2#
      • 1...Bf4
        • 2.Bxf4#
      • 1...Be5
        • 2.Se4#
      • 1...Sd5
        • 2.Sb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(a);N_GUARD,N_SPINP(b),XR(B)::QAB(C),XB(c)
    • R(e);OGATE,P_PINB(G),XS(F)::P(D),XR(e)
    • B(c);N_GUARD::B(G)
    • B(c);N_GUARD::B(G),XB(c)
    • B(c);SBLOCK::S(F)
    • S(i);N_SPINP(b),SBLOCK::S(F)
    • S(k);N_GUARD::B(G),XS(i)
  • Tries
    • Try
      • R(B);CHECK,XP(b)
      • Refutation
        • Q(a);XR(B)
    • Try
      • Q(C);CHECK,N_PINP(b)
      • Vars
        • S(i);N_GUARD,P_SPINS(i)::QAR1(C),XS(i)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • Q(C);CHECK,XP(b)
      • Vars
        • S(i);N_GUARD,P_SPINS(i)::QAR1(C),XS(i)
      • Refutation
        • Q(a);P_SPINQ(a),XQ(C)
    • Try
      • Q(C);CHECK,XB(c)
      • Vars
        • Q(a);P_PINB(G),P_SPINQ(a)::S(F)
      • Refutation
        • Q(a);P_SPINQ(a)
  • Actual
    • B(G);P_SPINS(F),XP(b)
    • Threat
      • R(B)+B(G),DCHECK
    • Vars
      • R(e);CHECK,OGATE,XS(F)::P(D),XR(e)
      • Q(a);N_GUARD,P_SPINQ(a),XB(G)::QAB(C),XB(c)
      • Q(a);N_GUARD,XR(B)::QAB(C),XB(c)
      • B(c);::R(B)+B(G),DCHECK,XB(c)
      • B(c);N_PINS(F),SBLOCK::S(F)
      • S(i);N_PINS(F),SBLOCK::S(F)
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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).