MESON Chess Problem Database

Problem Display
PID: 238276 (4b3/8/P1kB3Q/Kn6/1P2n3/2N4B/8/2R5 w - - 0 1)

Segers, Marcel

Norsk Sjakkblad, 1933

4b3/8/P1kB3Q/Kn6/1P2n3/2N4B/8/2R5

#2

8 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Sxb5+?
      • 1...Kd5
        • 2.Be6#
        • 2.Qe6#
      • 1...Sc5
        • 2.Rxc5#
      • 1...Sc3!
    • 1.Sd5+?
      • 1...Sec3
        • 2.Se7#
      • 1...Sc5
        • 2.Se7#
        • 2.Rxc5#
      • 1...Sbc3
        • 2.Se7#
      • 1...Kxd5!
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qd5#
      • 1...Sexc3
        • 2.Bg2#
      • 1...Sexd6
        • 2.Sxb5#
      • 1...Sbxc3
        • 2.b5#
      • 1...Sbxd6
        • 2.Sxe4#
      • 1...Bf7
        • 2.Qd7#
      • 1...Sf6
        • 2.Sxb5#
      • 1...Sc7
        • 2.Sxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);CHECK,XS(b)
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::R1(A),XS(a)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • S(B);CHECK
      • Vars
        • S(a);P_SPINS(a)::S(B)
        • S(b);P_SPINS(b)::S(B)
      • Refutation
        • K(c);S_FLIGHT,XS(B)
  • Actual
    • Q(H);
    • Threat
      • QAB1(H)
    • Vars
      • S(a);OGATEB,P_SPINS(a),XS(B)::B(C)
      • S(a);N_GUARD,P_SPINS(a),XB(G)::R(A)+S(B),XS(b)
      • S(b);OGATE,P_SPINS(b),XS(B)::P(D)
      • S(b);N_GUARD,P_SPINS(b),XB(G)::R(A)+S(B),XS(a)
      • B(d);N_GUARD::QAB1(H)
      • S(a);N_GUARD::R(A)+S(B),XS(b)
      • S(b);N_GUARD::R(A)+S(B),XS(a)
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