MESON Chess Problem Database

Problem Display
PID: 497 (8/BR6/K1pk1p2/N2p1P2/p1p5/r2Q4/qP2b3/8 w - - 0 1)

Hermanson, Halvar

The Observer, 1957

8/BR6/K1pk1p2/N2p1P2/p1p5/r2Q4/qP2b3/8

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Ke5
      • 2.Bb8#
    • 1...Qb1
      • 2.Sxc4#
    • 1...Qa1
      • 2.Sxc4#
    • 1...Qxb2
      • 2.Sxc4#
    • 1...Rb3
      • 2.Sxc4#
    • 1...d4
      • 2.Qxd4#
    • 1...c5
      • 2.Bb8#
  • Tries
    • 1.Rd7+?
      • 1...Ke5
        • 2.Bb8#
      • 1...Kxd7!
    • 1.Qxe2?
      • threat
        • 2.Qe6#
        • 2.Qe7#
      • 1...d4
        • 2.Qe6#
      • 1...Re3!
    • 1.Qd4?
      • threat
        • 2.Bc5#
        • 2.Bb8#
        • 2.Qxf6#
        • 2.Qf4#
      • 1...Qxb2
        • 2.Bc5#
        • 2.Bb8#
      • 1...Re3
        • 2.Bc5#
        • 2.Bb8#
      • 1...Rf3
        • 2.Bc5#
        • 2.Bb8#
        • 2.Qxf6#
      • 1...c5
        • 2.Bxc5#
        • 2.Bb8#
        • 2.Qxf6#
        • 2.Qf4#
      • 1...c3+!
  • Keys
    • 1.b4!
      • threat
        • 2.Bb8#
      • 1...Ke5
        • 2.Bb8#
      • 1...axb4 ep
        • 2.Qg3#
      • 1...cxb4 ep
        • 2.Sc4#
      • 1...d4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • K(h);N_SPINP(f),S_FLIGHT::B(F)
    • Q(a);N_GUARD::S(C),XP(e)
    • Q(a);N_GUARD,XP(A)::S(C),XP(e)
    • R(c);S_CUTQ(a)::S(C),XP(e)
    • P(f);OGATEB::QAR2(B),XP(f)
    • P(g);SBLOCK::B(F)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • K(h);N_SPINP(f),S_FLIGHT::B(F)
      • Refutation
        • K(h);P-FLIGHT,XR(G)
    • Try
      • Q(B);N_PINP(f),XB(b)
      • Threat
        • DUALS(2)
      • Vars
        • P(f);::QAR1(B)
      • Refutation
        • R(c);
    • Try
      • Q(B);
      • Threat
        • DUALS(4)
      • Refutation
        • P(e);CHECK
  • Actual
    • P(A);
    • Threat
      • B(F)
    • Vars
      • K(h);N_SPINP(f),S_FLIGHT::B(F)
      • P(d);EP,P_PINS(C),S_CUTR(c),XP(A)::QAB(B)
      • P(e);EP,P_PINQ(B),S_CUTQ(a),XP(A)::S(C)
      • P(f);OGATEB::QAR2(B),XP(f)
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