MESON Chess Problem Database

Problem Display
PID: 259441 (8/3KB3/1b6/3kP3/P1pp2R1/rr3pP1/BPNNP3/3R1Q2 w - - 0 1)

Cheylan, Yves

7th Prize, Schiffmann MT, 1980-1981

8/3KB3/1b6/3kP3/P1pp2R1/rr3pP1/BPNNP3/3R1Q2

#2

13 + 7

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe5
      • 2.Rg5#
  • Tries
    • 1.Sb4+?
      • 1...Kxe5
        • 2.Rg5#
      • 1...Rxb4!
    • 1.Sxf3?
      • threat
        • 2.e4#
      • 1...Rd3
        • 2.Sb4#
      • 1...Re3
        • 2.Sb4#
      • 1...Rxf3!
    • 1.Rg5?
      • threat
        • 2.e6#
      • 1...Re3
        • 2.Sb4#
        • 2.Bxc4#
      • 1...Bc7!
    • 1.Qxf3+?
      • 1...Kxe5
        • 2.Sxc4#
        • 2.Bd6#
        • 2.Bf6#
        • 2.Rg5#
        • 2.Qe4#
      • 1...Rxf3!
    • 1.e4+?
      • 1...Kxe5
        • 2.Sxc4#
        • 2.Rg5#
      • 1...dxe4 ep!
  • Keys
    • 1.Sxc4!
      • threat
        • 2.e4#
      • 1...Kxc4
        • 2.Se3#
      • 1...fxe2
        • 2.Qf7#
      • 1...Rd3
        • 2.Sb4#
      • 1...Re3
        • 2.Sb4#
      • 1...d3
        • 2.Qxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • K(f);OGATEB,P-FLIGHT,XP(K)::R(J)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(f);P-FLIGHT,S_CUTR(b),XP(K)::R(J)
      • Refutation
        • R(b);P_SPINP(d),XS(E)
    • Try
      • S(F);P_PINP(e),XP(c)
      • Threat
        • P(G)
      • Vars
        • R(b);N_GUARD,N_SPINP(e),P_SPINP(d)::S(E)
      • Refutation
        • R(b);N_SPINP(e),P_SPINP(d),XS(F)
    • Try
      • R(J);
      • Threat
        • R(J)+P(K)
      • Refutation
        • B(g);
    • Try
      • Q(B);CHECK,XP(c)
      • Refutation
        • R(b);P_SPINP(d),XQ(B)
    • Try
      • P(G);CHECK
      • Refutation
        • P(e);EP,XP(G)
  • Actual
    • S(F);P_PINP(e),XP(d)
    • Threat
      • P(G)
    • Vars
      • K(f);P_SPINR(b),S_FLIGHT,XS(F)::S(E)
      • P(c);OGATE,XP(G)::QAB(B)
      • R(b);N_GUARD,N_SPINP(e)::S(E)
      • R(b);N_GUARD::S(E)
      • P(e);S_CUTR(b)::QAB(B),XP(c)
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