MESON Chess Problem Database

Problem Display
PID: 264176 (3R4/3N2k1/3PK2p/3P4/1p2BpN1/2q5/3P4/Q7 w - - 0 1)

Hermanson, Halvar

Tijdschrift vd KNSB, 1952

3R4/3N2k1/3PK2p/3P4/1p2BpN1/2q5/3P4/Q7

#2

9 + 5

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Qxb2#
    • 1...Qd4
      • 2.Qxd4#
    • 1...Qe5+
      • 2.Qxe5#
    • 1...Qf6+
      • 2.Qxf6#
    • 1...b3
      • 2.Qxc3#
  • Tries
    • 1.Sc5?
      • threat
        • 2.Qa7#
      • 1...Qe5+
        • 2.Qxe5#
      • 1...Qf6+
        • 2.Qxf6#
      • 1...Qxa1!
    • 1.Qg1?
      • threat
        • 2.Se3#
      • 1...Qe5+
        • 2.Sgxe5#
      • 1...Qf6+
        • 2.Sgxf6#
      • 1...Qxd2
        • 2.Sf2#
      • 1...Qa1
        • 2.Qxa1#
      • 1...Qc1
        • 2.Qd4#
      • 1...Qe3
        • 2.Sxe3#
      • 1...Qf3
        • 2.Qd4#
      • 1...Qg3
        • 2.Qd4#
      • 1...Qh3
        • 2.Qd4#
      • 1...h5!
    • 1.dxc3?
      • threat
        • 2.cxb4#
        • 2.c4#
      • 1...bxc3
        • 2.Qxc3#
      • 1...b3!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Sc5#
      • 1...Qe5+
        • 2.Sdxe5#
      • 1...Qf6+
        • 2.Sdxf6#
      • 1...Qa1
        • 2.Qxa1#
      • 1...Qa3
        • 2.Qd4#
      • 1...Qc5
        • 2.Sxc5#
      • 1...Qc6
        • 2.Qd4#
      • 1...Qc7
        • 2.Qd4#
      • 1...Qc8
        • 2.Qd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • Q(a);OGATEB::QAB(A),XQ(a)
    • Q(a);OGATE::QAB(A),XQ(a)
    • Q(a);CHECK,OGATE::QAB(A),XQ(a)
    • Q(a);CHECK,OGATE::QAB1(A),XQ(a)
    • P(b);N_GUARD::QAB(A),XQ(a)
  • Tries
    • Try
      • S(H);
      • Threat
        • QAR(A)
      • Vars
        • Q(a);CHECK,OGATE::QAB(A),XQ(a)
        • Q(a);CHECK,OGATE::QAB1(A),XQ(a)
      • Refutation
        • Q(a);N_SPINQ(a),XQ(A)
    • Try
      • Q(A);N_PINQ(a)
      • Threat
        • QAR(A)+S(D)
      • Vars
        • Q(a);CHECK,N_GUARD::QAR(A)+S(D),XQ(a)
        • Q(a);N_GUARD,XP(B)::QAR(A)+S(D)
        • Q(a);OGATEB::QAB(A),XQ(a)
        • Q(a);N_GUARD::QAB(A)
        • Q(a);P_PINB(C)::QAR(A)+S(D),XQ(a)
        • Q(a);N_GUARD,P_PINS(D)::QAB(A)
      • Refutation
        • P(d);
    • Try
      • P(B);XQ(a)
      • Threat
        • DUALS(2)
      • Vars
        • P(b);OGATE,P_SPINP(b),XP(B)::QAB(A),XP(b)
      • Refutation
        • P(b);
  • Actual
    • Q(A);N_PINQ(a)
    • Threat
      • QAR(A)+S(H)
    • Vars
      • Q(a);CHECK,N_GUARD::QAR(A)+S(H),XQ(a)
      • Q(a);OGATEB::QAB(A),XQ(a)
      • Q(a);N_GUARD::QAB(A)
      • Q(a);::QAR(A)+S(H),XQ(a)
      • Q(a);N_GUARD,P_PINP(F)::QAB(A)
      • Q(a);N_GUARD,P_PINS(H)::QAB(A)
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).