MESON Chess Problem Database

Problem Display
PID: 259482 (2R5/5K2/3p3B/Q2nP3/2Pk3N/p2N4/2P1P3/2R2B2 w - - 0 1)

Cheylan, Yves

Schach-Echo, 1980

2R5/5K2/3p3B/Q2nP3/2Pk3N/p2N4/2P1P3/2R2B2

#2

12 + 4

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Qxd5#
  • Tries
    • 1.Bg2?
      • threat
        • 2.Sf5#
      • 1...Sb4
        • 2.c3#
      • 1...Se3
        • 2.c3#
      • 1...Se7
        • 2.c3#
        • 2.e3#
      • 1...Sc7!
    • 1.Qb6+?
      • 1...Kc3
        • 2.cxd5#
      • 1...Ke4
        • 2.Bg2#
      • 1...Sxb6!
    • 1.Qa7+?
      • 1...Kc3
        • 2.cxd5#
      • 1...Ke4
        • 2.Bg2#
      • 1...Sb6!
    • 1.c3+?
      • 1...Ke4
        • 2.Bg2#
        • 2.Qxd5#
      • 1...Sxc3!
    • 1.e3+?
      • 1...Ke4
        • 2.Bg2#
        • 2.Qxd5#
      • 1...Sxe3!
  • Keys
    • 1.Sf2!
      • threat
        • 2.Sf3#
      • 1...Kxe5
        • 2.Qxd5#
      • 1...Sb4
        • 2.c3#
      • 1...Sf4
        • 2.Sf5#
      • 1...Sc7
        • 2.e3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(b);N_GUARD,P-FLIGHT::QAB1(H),XS(c)
  • Tries
    • Try
      • B(B);
      • Threat
        • S(G)
      • Vars
        • S(c);N_GUARD::P(C)
      • Refutation
        • S(c);
    • Try
      • Q(H);CHECK
      • Vars
        • K(b);N_GUARD,S_FLIGHT::R(L)+P(F),XS(c)
        • K(b);N_GUARD,P-FLIGHT,S_CUTS(c)::B(B)
      • Refutation
        • S(c);XQ(H)
    • Try
      • Q(H);CHECK
      • Vars
        • K(b);N_GUARD,S_FLIGHT::R(L)+P(F),XS(c)
        • K(b);N_GUARD,P-FLIGHT,S_CUTS(c)::B(B)
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • P(C);CHECK
      • Refutation
        • S(c);XP(C)
    • Try
      • P(D);CHECK
      • Refutation
        • S(c);XP(D)
  • Actual
    • S(E);
    • Threat
      • S(G)
    • Vars
      • K(b);N_GUARD,P_SPINS(c),S_FLIGHT,XP(I)::QAR1(H),XS(c)
      • S(c);N_GUARD::P(C)
      • S(c);::S(G)
      • S(c);N_GUARD::P(D)
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