MESON Chess Problem Database

Problem Display
PID: 266371 (b2N4/q4n2/r6b/2PBk1BK/3pP3/6P1/1R5n/Q2R1r2 w - - 0 1)

Hermanson, Halvar

Die Schwalbe, 1973

b2N4/q4n2/r6b/2PBk1BK/3pP3/6P1/1R5n/Q2R1r2

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.gxf4#
    • 1...d3
      • 2.Ra2#
  • Tries
    • 1.Rf2?
      • threat
        • 2.Qxd4#
      • 1...Qxc5
        • 2.Sxf7#
      • 1...Rxd1
        • 2.Rf5#
      • 1...Rxa1
        • 2.Bf6#
      • 1...Ra4
        • 2.Bf6#
      • 1...Sf3!
    • 1.Rb7?
      • threat
        • 2.Qxd4#
      • 1...Rxd1
        • 2.Sxf7#
      • 1...Rxa1
        • 2.Sc6#
      • 1...Ra4
        • 2.Sc6#
      • 1...Sf3
        • 2.Sxf7#
      • 1...Qxc5!
  • Keys
    • 1.Rb6!
      • threat
        • 2.Qxd4#
      • 1...Rxd1
        • 2.Bf6#
      • 1...Rxa1
        • 2.Re6#
      • 1...Ra4
        • 2.Re6#
      • 1...Sf3
        • 2.Bf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(a);OGATE::P(D),XR(a)
    • P(c);OGATEB::QAB(A)+R(C)
  • Tries
    • Try
      • R(C);P_PINP(c)
      • Threat
        • QAB1(A),XP(c)
      • Vars
        • Q(g);N_GUARD,XP(F)::S(J),XS(h)
        • R(a);N_GUARD,XR(B)::R1(C)
        • R(e);N_GUARD,N_SPINP(c),XQ(A)::B(H)
        • R(e);N_GUARD::B(H)
      • Refutation
        • S(b);
    • Try
      • R(C);P_PINP(c)
      • Threat
        • QAB1(A),XP(c)
      • Vars
        • R(a);N_GUARD,XR(B)::S(J),XS(h)
        • R(e);N_GUARD,N_SPINP(c),XQ(A)::S(J)
        • R(e);N_GUARD::S(J)
        • S(b);S_CUTR(a)::S(J),XS(h)
      • Refutation
        • Q(g);XP(F)
  • Actual
    • R(C);P_PINP(c)
    • Threat
      • QAB1(A),XP(c)
    • Vars
      • R(a);N_GUARD,XR(B)::B(H)
      • R(e);N_GUARD,N_SPINP(c),XQ(A)::R1(C)
      • R(e);N_GUARD::R1(C)
      • S(b);S_CUTR(a)::B(H)
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