MESON Chess Problem Database

Problem Display
PID: 15417 (7K/1n1N2pp/2pQ1nr1/8/k5qR/p1B5/1RP1N1bp/3B2br w - - 0 1)

Froberg, Johan Hilding Laurentius

Suomen Shakki, 1983

7K/1n1N2pp/2pQ1nr1/8/k5qR/p1B5/1RP1N1bp/3B2br

#2

9 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Qb4
      • 2.Qxb4#
    • 1...Qc4
      • 2.Rxc4#
    • 1...Qd4
      • 2.Sb6#
    • 1...Qe4
      • 2.Qxc6#
    • 1...Bd4
      • 2.Qb4#
    • 1...Bb6
      • 2.Sxb6#
    • 1...Bf1
      • 2.Qxc6#
    • 1...Bh3
      • 2.Qxc6#
    • 1...Be4
      • 2.Qb4#
    • 1...Se4
      • 2.Qb4#
    • 1...Sc5
      • 2.Sb6#
    • 1...c5
      • 2.Sb6#
  • Tries
    • 1.Sd4?
      • threat
        • 2.Sb6#
        • 2.Qb4#
      • 1...Qxd7
        • 2.Qb4#
      • 1...Qxd4
        • 2.Sb6#
      • 1...Bxd4
        • 2.Qb4#
      • 1...Sxd7
        • 2.Qb4#
      • 1...Sxd6
        • 2.Sc5#
        • 2.Sb6#
      • 1...Sc5
        • 2.Sxc5#
        • 2.Sb6#
      • 1...c5
        • 2.Sb6#
      • 1...Sd5!
    • 1.Rb4+?
      • 1...Qxb4
        • 2.Qxb4#
      • 1...Ka5!
    • 1.Rxg4+?
      • 1...Bd4
        • 2.Sb6#
        • 2.Rxd4#
        • 2.Qb4#
        • 2.Qxd4#
      • 1...Be4
        • 2.Qb4#
        • 2.Qxc6#
      • 1...Se4
        • 2.Qb4#
      • 1...Sxg4
        • 2.Qb4#
      • 1...Rxg4!
    • 1.Qd4+?
      • 1...Qxd4
        • 2.Sb6#
      • 1...Bxd4!
  • Keys
    • 1.Be1!
      • threat
        • 2.c4#
      • 1...Qb4
        • 2.Qxb4#
      • 1...Qc4
        • 2.Rxc4#
      • 1...Qd4
        • 2.Sb6#
      • 1...Qe4
        • 2.Qxc6#
      • 1...Be4
        • 2.Qb4#
      • 1...Sa5
        • 2.Sc3#
      • 1...Sc5
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(g);N_GUARD::QAR1(G),XQ(g)
    • Q(g);OGATE::R(F),XQ(g)
    • Q(g);S_CUTB(a)::S(H)
    • Q(g);S_CUTB(c)::QAB(G),XP(h)
    • B(a);N_SPINQ(g),S_CUTQ(g)::QAR1(G)
    • B(a);N_GUARD::S(H),XB(a)
    • B(c);N_GUARD::QAB(G),XP(h)
    • B(c);N_SPINQ(g),S_CUTQ(g)::QAR1(G)
    • S(i);N_SPINQ(g),S_CUTQ(g)::QAR1(G)
    • S(k);S_CUTB(a)::S(H)
    • P(h);S_CUTB(a)::S(H)
  • Tries
    • Try
      • S(D);N_PINQ(g)
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);XS(H)::QAR1(G)
        • Q(g);P_SPINQ(g),XS(D)::S(H)
        • B(a);XS(D)::QAR1(G)
        • S(i);XS(H)::QAR1(G)
        • P(h);::S(H)
      • Refutation
        • S(i);
    • Try
      • R(B);CHECK,N_PINQ(g)
      • Vars
        • Q(g);OGATE,P_SPINQ(g),XR(B)::QAR1(G),XQ(g)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • R(F);CHECK,XQ(g)
      • Vars
        • S(i);P_SPINS(i)::QAR1(G)
        • S(i);XR(F)::QAR1(G)
      • Refutation
        • R(j);XR(F)
    • Try
      • Q(G);CHECK,N_PINQ(g)
      • Vars
        • Q(g);P_SPINQ(g),XQ(G)::S(H)
      • Refutation
        • B(a);XQ(G)
  • Actual
    • B(E);
    • Threat
      • B(A)+P(C)
    • Vars
      • Q(g);N_GUARD::QAR1(G),XQ(g)
      • Q(g);OGATE::R(F),XQ(g)
      • Q(g);S_CUTB(a)::S(H)
      • Q(g);S_CUTB(c)::QAB(G),XP(h)
      • B(c);N_SPINQ(g),S_CUTQ(g)::QAR1(G)
      • S(k);SBLOCK::S(D)
      • S(k);S_CUTB(a)::S(H)
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).