MESON Chess Problem Database

Problem Display
PID: 238137 (8/8/1R6/8/qN2Q3/P1B5/2N5/1k1K4 w - - 0 1)

Hermanson, Halvar

Skakbladet, 1975

8/8/1R6/8/qN2Q3/P1B5/2N5/1k1K4

#2

7 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc2+
      • 2.Qxc2#
    • 1...Qd7+
      • 2.Sd4#
    • 1...Qxa3
      • 2.Sa1#
      • 2.Se1#
      • 2.Sxa3#
      • 2.Se3#
      • 2.Sd4#
    • 1...Qxb4
      • 2.Sxb4#
    • 1...Qa5
      • 2.Sa1#
      • 2.Se1#
      • 2.Se3#
      • 2.Sd4#
    • 1...Qa7
      • 2.Sa1#
      • 2.Se1#
      • 2.Se3#
      • 2.Sd4#
  • Tries
    • 1.Kd2?
      • threat
        • 2.Qh1#
        • 2.Qe1#
      • 1...Qxc2+
        • 2.Qxc2#
      • 1...Qd7+
        • 2.Sd4#
      • 1...Qxa3
        • 2.Sa1#
        • 2.Se1#
        • 2.Sxa3#
        • 2.Se3#
        • 2.Sd4#
      • 1...Qxb4
        • 2.Sxb4#
      • 1...Qb5
        • 2.Qe1#
      • 1...Qc6
        • 2.Qe1#
      • 1...Qa6
        • 2.Qe1#
      • 1...Qa8
        • 2.Qe1#
      • 1...Qe8!
    • 1.Qc4?
      • threat
        • 2.Qa2#
      • 1...Qxc2+
        • 2.Sxc2#
      • 1...Qxa3
        • 2.Sxa3#
      • 1...Qxb4
        • 2.Rxb4#
      • 1...Qb3
        • 2.Qxb3#
      • 1...Qd7+!
    • 1.Qe6?
      • threat
        • 2.Qa2#
      • 1...Qxc2+
        • 2.Sxc2#
      • 1...Qxa3
        • 2.Sxa3#
      • 1...Qxb4
        • 2.Rxb4#
      • 1...Qb3
        • 2.Qxb3#
      • 1...Qd7+!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qa2#
      • 1...Qxc2+
        • 2.Sxc2#
      • 1...Qxa3
        • 2.Sxa3#
      • 1...Qxb4
        • 2.Rxb4#
      • 1...Qb3
        • 2.Qxb3#
      • 1...Qd7
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(b);CHECK,OGATE,P_SPINQ(b),XS(B)::QAB1(F),XQ(b)
    • Q(b);CHECK,N_PINS(B)::QAB(F)+S(B)
    • Q(b);N_PINS(B),P_SPINQ(b),XS(E)::QAB(F)+S(B),XQ(b)
  • Tries
    • Try
      • K(A);N_SPINS(B),P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);CHECK,OGATE,P_SPINQ(b),XS(B)::QAB1(F),XQ(b)
        • Q(b);CHECK,N_GUARD::QAB(F)+S(B)
        • Q(b);P_PINB(D),P_SPINQ(b),XS(E)::QAB(F)+S(B),XQ(b)
        • Q(b);::QAR(F)
      • Refutation
        • Q(b);
    • Try
      • Q(F);
      • Threat
        • QAB1(F)
      • Vars
        • Q(b);CHECK,XS(B)::R(G)+S(E),XQ(b)
        • Q(b);N_PINS(B),XP(C)::S(B),XQ(b)
        • Q(b);N_PINS(B),OGATE,P_SPINQ(b),XS(E)::R(G),XQ(b)
        • Q(b);N_GUARD::QAR2(F),XQ(b)
      • Refutation
        • Q(b);CHECK,N_PINS(B)
    • Try
      • Q(F);
      • Threat
        • QAB1(F)
      • Vars
        • Q(b);CHECK,XS(B)::R(G)+S(E),XQ(b)
        • Q(b);N_PINS(B),XP(C)::S(B),XQ(b)
        • Q(b);N_PINS(B),OGATE,P_SPINQ(b),XS(E)::R(G),XQ(b)
        • Q(b);N_GUARD::QAR2(F),XQ(b)
      • Refutation
        • Q(b);CHECK,N_PINS(B)
  • Actual
    • Q(F);
    • Threat
      • QAB1(F)
    • Vars
      • Q(b);CHECK,XS(B)::R(G)+S(E),XQ(b)
      • Q(b);N_PINS(B),XP(C)::S(B),XQ(b)
      • Q(b);N_PINS(B),OGATE,P_SPINQ(b),XS(E)::R(G),XQ(b)
      • Q(b);N_GUARD::QAR2(F),XQ(b)
      • Q(b);N_GUARD,N_PINS(B),P_PINQ(F)::R(G)+S(E)
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).