MESON Chess Problem Database

Problem Display
PID: 216419 (8/8/6RK/5p2/4p2k/7N/3nr1P1/3Qb3 w - - 0 1)

Doudon, Max

diagrammes, 1975

8/8/6RK/5p2/4p2k/7N/3nr1P1/3Qb3

#2

5 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Rf2
      • 2.Qh5#
    • 1...Rxg2
      • 2.Qh5#
    • 1...Re3
      • 2.Qh5#
    • 1...Sb1
      • 2.Qd8#
    • 1...Sf1
      • 2.Qd8#
    • 1...Sb3
      • 2.Qd8#
    • 1...Sc4
      • 2.Qd8#
  • Tries
    • 1.Qxe2?
      • threat
        • 2.Qh5#
        • 2.Qxe1#
      • 1...Bg3
        • 2.Qh5#
      • 1...Bf2
        • 2.Qh5#
        • 2.Qxf2#
      • 1...Sf1
        • 2.Qh5#
      • 1...Sf3!
    • 1.Qxe1+?
      • 1...Rf2
        • 2.Qxf2#
      • 1...Rxe1!
  • Keys
    • 1.Sf2!
      • threat
        • 2.g3#
      • 1...Rxf2
        • 2.Qh5#
      • 1...Bxf2
        • 2.Qh1#
      • 1...Re3
        • 2.Qh5#
      • 1...Sf1
        • 2.Qd8#
      • 1...f4
        • 2.Rg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • R(c);OGATE::QAR1(A)
    • R(c);OGATE,XP(B)::QAR1(A)
    • S(b);OGATE::QAB(A)
  • Tries
    • Try
      • Q(A);XR(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAR1(A)
        • S(b);::QAR1(A)
      • Refutation
        • S(b);
    • Try
      • Q(A);CHECK,XB(a)
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAB(A),XR(c)
      • Refutation
        • R(c);XQ(A)
  • Actual
    • S(C);
    • Threat
      • P(B)
    • Vars
      • R(c);OGATE,XS(C)::QAR1(A)
      • B(a);OGATE,XS(C)::QAR(A)
      • R(c);OGATE::QAR1(A)
      • S(b);OGATE::QAB(A)
      • P(f);N_GUARD::R1(D)
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