MESON Chess Problem Database

Problem Display
PID: 84894 (5b2/4Rn2/r3Rr2/1pBPp3/1Nk1N3/2P3p1/b1P5/Q5K1 w - - 0 1)

Petite, Efren

1st Prize, Sachsische Zeitung, 1990

5b2/4Rn2/r3Rr2/1pBPp3/1Nk1N3/2P3p1/b1P5/Q5K1

#2

10 + 9

6490 yacpdb 2009
136 Problem Observer 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Rb6
      • 2.Qxa2#
    • 1...Rc6
      • 2.Qxa2#
    • 1...Rd6
      • 2.Qxa2#
    • 1...Raxe6
      • 2.Qxa2#
    • 1...Rf1+
      • 2.Qxf1#
    • 1...Rfxe6
      • 2.Qf1#
    • 1...Rg6
      • 2.Qf1#
    • 1...Rh6
      • 2.Qf1#
  • Tries
    • 1.Be3?
      • threat
        • 2.Sd2#
      • 1...Rf1+
        • 2.Qxf1#
      • 1...Rf2!
    • 1.Rc6?
      • threat
        • 2.Sd2#
      • 1...Rf1+
        • 2.Qxf1#
      • 1...Raxc6
        • 2.Qxa2#
      • 1...Rfxc6
        • 2.Qf1#
      • 1...Rf2
        • 2.Bb6#
      • 1...Bh6!
    • 1.Rc7?
      • threat
        • 2.Sd2#
      • 1...Rf1+
        • 2.Qxf1#
      • 1...Bxc5+
        • 2.Rxc5#
      • 1...Rc6
        • 2.Qxa2#
      • 1...Bh6
        • 2.Bb6#
      • 1...Rf2!
    • 1.Qd1?
      • threat
        • 2.Qe2#
        • 2.Qd3#
      • 1...Rf1+
        • 2.Qxf1#
      • 1...Rf2
        • 2.Qd3#
      • 1...Rf3!
  • Keys
    • 1.Bb6!
      • threat
        • 2.Sd2#
      • 1...Rf1+
        • 2.Qxf1#
      • 1...Rxb6
        • 2.Qxa2#
      • 1...Rf2
        • 2.Rc6#
      • 1...Bh6
        • 2.Rc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • R(f);N_GUARD::QAB(A),XB(a)
    • R(f);N_GUARD,XR(I)::QAB(A),XB(a)
    • R(g);CHECK,N_GUARD::QAB(A),XR(g)
    • R(g);N_GUARD,XR(I)::QAB(A)
    • R(g);N_GUARD::QAB(A)
  • Tries
    • Try
      • B(G);
      • Threat
        • S(F)
      • Vars
        • R(g);CHECK,N_GUARD::QAB(A),XR(g)
      • Refutation
        • R(g);
    • Try
      • R(I);
      • Threat
        • S(F)
      • Vars
        • R(g);CHECK,N_GUARD::QAB(A),XR(g)
        • R(f);N_GUARD,XR(I)::QAB(A),XB(a)
        • R(g);N_GUARD,XR(I)::QAB(A)
        • R(g);N_GUARD::R(I)+B(G)
      • Refutation
        • B(i);
    • Try
      • R(J);
      • Threat
        • S(F)
      • Vars
        • R(g);CHECK,N_GUARD::QAB(A),XR(g)
        • B(i);CHECK,OGATE,P_SPINB(i),XB(G)::R1(J),XB(i)
        • R(f);N_GUARD::QAB(A),XB(a)
        • B(i);N_GUARD::R(J)+B(G)
      • Refutation
        • R(g);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(g);CHECK,N_GUARD::QAB(A),XR(g)
        • R(g);::QAB1(A)
      • Refutation
        • R(g);
  • Actual
    • B(G);
    • Threat
      • S(F)
    • Vars
      • R(g);CHECK,N_GUARD::QAB(A),XR(g)
      • R(f);N_GUARD,XB(G)::QAB(A),XB(a)
      • R(g);N_GUARD::R(I)
      • B(i);N_GUARD::R(J)
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