MESON Chess Problem Database

Problem Display
PID: 78698 (3r4/4R3/p1rp3n/Kp1p4/3kN3/R2PN3/6QB/3n1B2 w - - 0 1)

Diot, Roger

2nd Prize, The Problemist, 1956

3r4/4R3/p1rp3n/Kp1p4/3kN3/R2PN3/6QB/3n1B2

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rc2
      • 2.Sxc2#
    • 1...Rb6
      • 2.Sc2#
    • 1...Sc3
      • 2.Sc2#
    • 1...Sxe3
      • 2.Qg7#
    • 1...Sg4
      • 2.Sf5#
    • 1...Sf5
      • 2.Sxf5#
    • 1...Sf7
      • 2.Sf5#
    • 1...Sg8
      • 2.Sf5#
  • Tries
    • 1.Sd2?
      • threat
        • 2.Qxd5#
      • 1...Kc5
        • 2.Sb3#
        • 2.Qxd5#
      • 1...Rc5
        • 2.Sf3#
        • 2.Qg7#
      • 1...Sc3
        • 2.Sb3#
      • 1...Sxe3!
    • 1.Sg5?
      • threat
        • 2.Qxd5#
      • 1...Kc5
        • 2.Se6#
        • 2.Qxd5#
      • 1...Sxe3
        • 2.Se6#
      • 1...Rc5
        • 2.Sf3#
      • 1...Sc3!
    • 1.Be5+?
      • 1...Kxe3
        • 2.Qh3#
        • 2.Qe2#
        • 2.Qg3#
      • 1...dxe5!
    • 1.Qb2+?
      • 1...Kxe3
        • 2.Sg5#
      • 1...Rc3
        • 2.Sc2#
      • 1...Sc3
        • 2.Sc2#
      • 1...Sxb2!
  • Keys
    • 1.Sc5!
      • threat
        • 2.Qxd5#
      • 1...Kxc5
        • 2.Qxd5#
      • 1...Rxc5
        • 2.Qg7#
      • 1...Sxe3
        • 2.Se6#
      • 1...dxc5
        • 2.Sc2#
      • 1...Sc3
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • R(f);N_GUARD::S(F),XR(f)
    • R(f);N_GUARD::S(F)
    • S(a);S_CUTR(f)::S(F)
    • S(a);SBLOCK,XS(F)::QAB(B)
    • S(h);N_GUARD::S(F)
    • S(h);N_GUARD::S(F),XS(h)
  • Tries
    • Try
      • S(G);
      • Threat
        • QAR1(B),XP(d)
      • Vars
        • S(a);SBLOCK::S(G)
      • Refutation
        • S(a);XS(F)
    • Try
      • S(G);
      • Threat
        • QAR1(B),XP(d)
      • Vars
        • S(a);SBLOCK,XS(F)::S(G)
        • R(f);SBLOCK::S(G)
      • Refutation
        • S(a);
    • Try
      • B(C);CHECK
      • Refutation
        • P(g);XB(C)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT,XS(F)::R(I)+S(G)
        • R(f);P_SPINR(f)::S(F)
        • S(a);P_SPINS(a)::S(F)
      • Refutation
        • S(a);XQ(B)
  • Actual
    • S(G);
    • Threat
      • QAR1(B),XP(d)
    • Vars
      • K(b);S_FLIGHT,XS(G)::QAR1(B),XP(d)
      • R(f);SBLOCK,XS(G)::QAB(B)
      • S(a);SBLOCK,XS(F)::S(G)
      • P(g);SBLOCK,XS(G)::S(F)
      • S(a);SBLOCK::S(G)
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