MESON Chess Problem Database

Problem Display
PID: 238127 (B3N2b/2pN1Q2/q1p1p1r1/1RpkpR2/n5n1/3PP2b/8/2K5 w - - 0 1)

Hermanson, Halvar

Mat, 1973

B3N2b/2pN1Q2/q1p1p1r1/1RpkpR2/n5n1/3PP2b/8/2K5

#2

9 + 12

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sb2
      • 2.Rxc5#
    • 1...Sc3
      • 2.Rxc5#
    • 1...Sb6
      • 2.Rxc5#
    • 1...Sf6
      • 2.Rxe5#
  • Tries
    • 1.Sxc5?
      • threat
        • 2.Qd7#
      • 1...Qc8
        • 2.Sxa4#
      • 1...Rg7
        • 2.Qxe6#
      • 1...Sb6
        • 2.Sxa6#
      • 1...Sf6
        • 2.Qxe6#
      • 1...Qxb5!
    • 1.Sb6+?
      • 1...Qxb6
        • 2.Qd7#
      • 1...cxb6
        • 2.Qd7#
      • 1...Sxb6!
    • 1.Sdf6+?
      • 1...Rxf6
        • 2.Qd7#
      • 1...Bxf6
        • 2.Qd7#
      • 1...Sxf6!
    • 1.Rxe5+?
      • 1...Bxe5
        • 2.Qf3#
      • 1...Sxe5!
  • Keys
    • 1.Sxe5!
      • threat
        • 2.Qd7#
      • 1...Qc8
        • 2.Bxc6#
      • 1...Rg7
        • 2.Sxg4#
      • 1...Sb6
        • 2.Bxc6#
      • 1...Sf6
        • 2.Sg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • S(b);N_GUARD::R1(D),XP(d)
    • S(c);N_GUARD,S_CUTB(l)::R1(E),XP(f)
  • Tries
    • Try
      • S(F);P_PINP(f),XP(d)
      • Threat
        • QAR2(G)
      • Vars
        • Q(g);N_GUARD::R(D)+S(F),XS(b)
        • R(j);N_GUARD::QAB1(G),XP(i)
        • S(b);N_GUARD::R(D)+S(F),XQ(g)
        • S(c);S_CUTR(j)::QAB1(G),XP(i)
      • Refutation
        • Q(g);XR(D)
    • Try
      • S(F);CHECK
      • Vars
        • Q(g);XS(F)::QAR2(G)
        • P(k);XS(F)::QAR2(G)
      • Refutation
        • S(b);XS(F)
    • Try
      • S(F);CHECK
      • Vars
        • R(j);XS(F)::QAR2(G)
        • B(l);XS(F)::QAR2(G)
      • Refutation
        • S(c);XS(F)
    • Try
      • R(E);CHECK,XP(f)
      • Vars
        • B(l);XR(E)::QAB(G)
      • Refutation
        • S(c);XR(E)
  • Actual
    • S(F);XP(f)
    • Threat
      • QAR2(G)
    • Vars
      • Q(g);N_GUARD::B(H),XP(h)
      • R(j);S_CUTB(l)::R(E)+S(F),XS(c)
      • S(b);S_CUTQ(g)::B(H),XP(h)
      • S(c);S_CUTB(l)::R(E)+S(F)
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