MESON Chess Problem Database

Problem Display
PID: 239840 (KBR4b/n7/8/3p4/1P1kB3/N2p3p/7Q/3n1N1b w - - 0 1)

Hermanson, Halvar

Themes-64, 1970

KBR4b/n7/8/3p4/1P1kB3/N2p3p/7Q/3n1N1b

#2

8 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe4
      • 2.Qf4#
    • 1...Bxe4
      • 2.Bxa7#
    • 1...Be5
      • 2.Qxe5#
    • 1...dxe4
      • 2.Qd6#
  • Tries
    • 1.Sc2+?
      • 1...Kxe4
        • 2.Qf4#
      • 1...dxc2!
    • 1.Sb5+?
      • 1...Kxe4
        • 2.Qf4#
      • 1...Sxb5!
    • 1.Be5+?
      • 1...Kxe4
        • 2.Qf4#
      • 1...Bxe5!
    • 1.Qg1+?
      • 1...Kxe4
        • 2.Qg4#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sf2!
    • 1.Qg3?
      • threat
        • 2.Qxd3#
      • 1...Kxe4
        • 2.Qf4#
        • 2.Qg4#
      • 1...Bxe4
        • 2.Bxa7#
      • 1...dxe4
        • 2.Qd6#
      • 1...Sb2
        • 2.Qe3#
      • 1...Sf2
        • 2.Qe3#
      • 1...Se3
        • 2.Qxe3#
      • 1...d2
        • 2.Qd3#
      • 1...Bf3!
    • 1.Qf2+?
      • 1...Kxe4
        • 2.Sd2#
        • 2.Sg3#
        • 2.Qf4#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sxf2!
    • 1.Qxh3?
      • threat
        • 2.Qxd3#
      • 1...Kxe4
        • 2.Qg4#
      • 1...Bxe4
        • 2.Qxh8#
      • 1...dxe4
        • 2.Qd7#
      • 1...Sb2
        • 2.Qe3#
      • 1...Sf2
        • 2.Qe3#
      • 1...Se3
        • 2.Qxe3#
      • 1...d2
        • 2.Qd3#
      • 1...Bf3!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Qxd3#
      • 1...Kxe4
        • 2.Qf4#
      • 1...Bxe4
        • 2.Sc2#
      • 1...dxe4
        • 2.Rd8#
      • 1...Sb2
        • 2.Qe3#
      • 1...Sf2
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(e);OGATEB,P-FLIGHT,XB(E)::QAR1(B)
    • B(b);SBLOCK,XB(E)::B(G),XS(g)
    • B(h);N_GUARD::QAB1(B),XB(h)
    • P(f);OGATEB,SBLOCK,XB(E)::QAR2(B)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(e);P-FLIGHT,XB(E)::QAR1(B)
      • Refutation
        • P(c);XS(C)
    • Try
      • S(C);CHECK
      • Vars
        • K(e);P-FLIGHT,XB(E)::QAR1(B)
      • Refutation
        • S(g);XS(C)
    • Try
      • B(G);CHECK
      • Vars
        • K(e);P-FLIGHT,XB(E)::QAR1(B)
      • Refutation
        • B(h);XB(G)
    • Try
      • Q(B);CHECK
      • Vars
        • K(e);OGATEB,P-FLIGHT,XB(E)::QAR2(B)
        • S(a);N_GUARD,P_SPINS(a)::QAB1(B),XS(a)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(B);
      • Threat
        • QAR1(B),XP(c)
      • Vars
        • B(b);SBLOCK,XB(E)::B(G),XS(g)
        • P(f);OGATEB,SBLOCK,XB(E)::QAR2(B)
        • S(a);N_GUARD::QAB1(B)
        • S(a);N_GUARD::QAB1(B),XS(a)
        • P(c);::QAR1(B)
      • Refutation
        • B(b);
    • Try
      • Q(B);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(B),XS(a)
      • Refutation
        • S(a);XQ(B)
    • Try
      • Q(B);XP(d)
      • Threat
        • QAR1(B),XP(c)
      • Vars
        • K(e);OGATEB,P-FLIGHT,XB(E)::QAR2(B)
        • B(b);SBLOCK,XB(E)::QAB(B),XB(h)
        • P(f);OGATEB,SBLOCK,XB(E)::QAR(B)
        • S(a);N_GUARD::QAB1(B)
        • S(a);N_GUARD::QAB1(B),XS(a)
        • P(c);::QAR1(B)
      • Refutation
        • B(b);
  • Actual
    • Q(B);P_PINP(c)
    • Threat
      • QAR1(B),XP(c)
    • Vars
      • K(e);N_SPINP(c),OGATEB,P-FLIGHT,XB(E)::QAR1(B)
      • B(b);SBLOCK,XB(E)::S(C)
      • P(f);OGATEB,SBLOCK,XB(E)::R(H)
      • S(a);N_GUARD::QAB1(B)
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