MESON Chess Problem Database

Problem Display
PID: 84172 (qRr2kr1/1pQ3p1/2n1RP2/p3p2b/1p1p3N/8/2B5/2K5 w - - 0 1)

Cheylan, Yves

Probleemblad, 1974

qRr2kr1/1pQ3p1/2n1RP2/p3p2b/1p1p3N/8/2B5/2K5

#2

7 + 12

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rh8
      • 2.Qxg7#
    • 1...Bd1
      • 2.Sg6#
    • 1...Be2
      • 2.Sg6#
    • 1...Bf3
      • 2.Sg6#
    • 1...Bg4
      • 2.Sg6#
    • 1...Bg6
      • 2.Sxg6#
    • 1...Sa7
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
    • 1...Sxb8
      • 2.Qe7#
    • 1...Sd8
      • 2.Qe7#
  • Tries
    • 1.Rxc8+?
      • 1...Be8
        • 2.Sg6#
        • 2.Rexe8#
      • 1...Sd8
        • 2.Qe7#
      • 1...Qxc8!
    • 1.Qd6+?
      • 1...Se7
        • 2.Qxe7#
      • 1...Kf7!
    • 1.Qxc8+?
      • 1...Kf7
        • 2.Qxg8#
      • 1...Be8
        • 2.Qxe8#
      • 1...Sd8!
  • Keys
    • 1.Bg6!
      • threat
        • 2.Qf7#
      • 1...Bxg6
        • 2.Sxg6#
      • 1...Sxb8
        • 2.Qxc8#
      • 1...Sa7
        • 2.Qc5#
      • 1...Se7
        • 2.fxe7#
      • 1...Sd8
        • 2.Re8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • R(l);N_GUARD::QAB1(F),XP(h)
    • B(e);N_GUARD::S(C)
    • B(e);N_GUARD::S(C),XB(e)
    • S(f);N_GUARD::QAB1(F)
    • S(f);N_GUARD::QAB1(F),XS(f)
    • S(f);N_GUARD,N_SPINR(j),XR(G)::QAB1(F)
    • S(f);N_GUARD,N_SPINR(j)::QAB1(F)
  • Tries
    • Try
      • R(G);CHECK,XR(j)
      • Vars
        • S(f);P_SPINS(f)::QAB1(F)
      • Refutation
        • Q(i);XR(G)
    • Try
      • Q(F);CHECK
      • Vars
        • S(f);N_GUARD,P_PINB(B),P_SPINS(f)::QAB1(F),XS(f)
      • Refutation
        • K(k);N_SPINR(j),P-FLIGHT
    • Try
      • Q(F);CHECK,XR(j)
      • Vars
        • K(k);OGATE,P-FLIGHT::QAB1(F),XR(l)
        • B(e);N_GUARD,P_SPINB(e)::QAR1(F),XB(e)
      • Refutation
        • S(f);P_SPINS(f)
  • Actual
    • B(B);
    • Threat
      • QAR1(F)
    • Vars
      • B(e);XB(B)::S(C),XB(e)
      • S(f);N_GUARD,N_SPINR(j),P_PINQ(F),XR(G)::QAR(F),XR(j)
      • S(f);OGATE,P_PINQ(F)::QAB(F)
      • S(f);OGATE,P_PINQ(F)::P(E),XS(f)
      • S(f);N_SPINR(j),P_PINQ(F),S_CUTR(j)::R1(D)
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