MESON Chess Problem Database

Problem Display
PID: 11646 (8/2Q1p1K1/3pp3/R1BNk3/2p1P1P1/3b1np1/1N6/4R3 w - - 0 1)

Sammelius, Carel Johan Robert

3rd HM., Probleemblad, 1970/I

8/2Q1p1K1/3pp3/R1BNk3/2p1P1P1/3b1np1/1N6/4R3

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bb1
      • 2.Sxc4#
    • 1...Bc2
      • 2.Sxc4#
    • 1...c3
      • 2.Sxd3#
  • Tries
    • 1.Sc3?
      • threat
        • 2.Be3#
      • 1...Bxe4
        • 2.Rxe4#
      • 1...Sd4
        • 2.Bxd6#
      • 1...Kf4!
    • 1.Be3?
      • threat
        • 2.Sc3#
        • 2.Sf6#
      • 1...Kxe4
        • 2.Sc3#
      • 1...Bxe4
        • 2.Sxc4#
      • 1...exd5
        • 2.Qxe7#
      • 1...Sd4
        • 2.Bf4#
      • 1...c3!
    • 1.Bxd6+?
      • 1...Kd4
        • 2.Bc5#
        • 2.Qb6#
        • 2.Qc5#
        • 2.Qa7#
      • 1...exd6!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Be3#
      • 1...Kf4
        • 2.Be3#
      • 1...Bxe4
        • 2.Rxe4#
      • 1...exf6
        • 2.Qxd6#
      • 1...Sd4
        • 2.Bxd6#
      • 1...c3
        • 2.Sxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::S(B),XP(d)
    • P(d);N_GUARD::S(B),XB(a)
  • Tries
    • Try
      • S(G);
      • Threat
        • R(E)+B(F)
      • Vars
        • B(a);OGATE,P_SPINB(a),XP(C)::R1(A),XB(a)
        • S(b);SBLOCK::R(E)+B(F),DCHECK,XP(f)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • B(F);
      • Threat
        • DUALS(2)
      • Vars
        • K(e);N_SPINP(f),P-FLIGHT,XP(C)::S(G)
        • B(a);N_GUARD,SBLOCK,XP(C)::S(B),XP(d)
        • P(g);N_SPINP(f),OGATEB,P_SPINP(g),XS(G)::QAR2(H),XP(h)
        • S(b);SBLOCK::B(F)
      • Refutation
        • P(d);
    • Try
      • B(F);CHECK,XP(f)
      • Refutation
        • P(h);P_SPINP(h),XB(F)
  • Actual
    • S(G);
    • Threat
      • R(E)+B(F)
    • Vars
      • K(e);S_FLIGHT::B(F)
      • B(a);OGATE,P_SPINB(a),XP(C)::R1(A),XB(a)
      • P(h);N_GUARD,XS(G)::QAB1(H),XP(f)
      • S(b);SBLOCK::R(E)+B(F),DCHECK,XP(f)
      • P(d);N_GUARD::S(B),XB(a)
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