MESON Chess Problem Database

Problem Display
PID: 238937 (Kn2N3/Q7/1r6/3P1k1P/4NP1p/b3PP2/2R5/qB4r1 w - - 0 1)

Petite, Efren

L'Italia Scacchistica, 1988

Kn2N3/Q7/1r6/3P1k1P/4NP1p/b3PP2/2R5/qB4r1

#2

11 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rb2
      • 2.Qf7#
    • 1...Rb4
      • 2.S4d6#
      • 2.S8d6#
    • 1...Sc6
      • 2.Qd7#
  • Tries
    • 1.Rb2?
      • threat
        • 2.Sg3#
        • 2.S4d6#
      • 1...Rxb1
        • 2.Sg7#
      • 1...Rg3
        • 2.Sxg3#
        • 2.S4d6#
      • 1...Rd6
        • 2.Sg3#
        • 2.S4xd6#
      • 1...Bd6
        • 2.Sg3#
        • 2.S4xd6#
      • 1...Qxb1!
    • 1.Rc3?
      • threat
        • 2.Sg3#
        • 2.S4d6#
      • 1...Rgxb1
        • 2.Sg7#
      • 1...Rbxb1
        • 2.Qf7#
      • 1...Rg3
        • 2.Sxg3#
        • 2.S4d6#
      • 1...Rd6
        • 2.Sg3#
        • 2.S4xd6#
      • 1...Bd6
        • 2.Sg3#
        • 2.S4xd6#
      • 1...Qxb1!
    • 1.Rc6?
      • threat
        • 2.Sg3#
        • 2.S4d6#
      • 1...Qxb1
        • 2.Qf7#
      • 1...Rgxb1
        • 2.Qh7#
      • 1...Rg3
        • 2.Sxg3#
        • 2.S4d6#
      • 1...Bd6
        • 2.Sg3#
        • 2.S4xd6#
        • 2.S8xd6#
      • 1...Rbxb1!
    • 1.Qd7+?
      • 1...Re6
        • 2.Qxe6#
      • 1...Sxd7!
  • Keys
    • 1.Rg2!
      • threat
        • 2.Sg3#
        • 2.S4d6#
      • 1...Qxb1
        • 2.Sg7#
      • 1...Rgxb1
        • 2.Rg5#
      • 1...Rbxb1
        • 2.Qh7#
      • 1...Rd6
        • 2.Sg3#
        • 2.S4xd6#
      • 1...Bd6
        • 2.Sg3#
        • 2.S4xd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • R(f);N_GUARD,S_CUTQ(a)::QAR2(I)
    • S(g);N_GUARD,S_CUTR(f)::QAB(I)
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);N_GUARD,XB(A)::S(K)
      • Refutation
        • Q(a);XB(A)
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);N_GUARD,XB(A)::S(K)
        • R(f);N_GUARD,XB(A)::QAR2(I)
      • Refutation
        • Q(a);XB(A)
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);N_GUARD,XB(A)::QAR2(I)
        • R(b);N_GUARD,XB(A)::QAB(I)
      • Refutation
        • R(f);XB(A)
    • Try
      • Q(I);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAB1(I),XR(f)
      • Refutation
        • S(g);XQ(I)
  • Actual
    • R(B);
    • Threat
      • DUALS(2)
    • Vars
      • Q(a);N_GUARD,XB(A)::S(K)
      • R(b);N_GUARD,XB(A)::R1(B)
      • R(f);N_GUARD,XB(A)::QAB(I)
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