MESON Chess Problem Database

Problem Display
PID: 179757 (6b1/KR6/P1B5/k1p3Q1/NNp5/4q3/3r4/5R2 w - - 0 1)

Petite, Efren

Problem Observer, 2011

6b1/KR6/P1B5/k1p3Q1/NNp5/4q3/3r4/5R2

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Qxc5#
    • 1...Qe1
      • 2.Qxc5#
    • 1...Qe2
      • 2.Qxc5#
    • 1...Qa3
      • 2.Qxc5#
    • 1...Qb3
      • 2.Qxc5#
    • 1...Qc3
      • 2.Qxc5#
    • 1...Qd3
      • 2.Qxc5#
    • 1...Qf3
      • 2.Qxc5#
    • 1...Qg3
      • 2.Qxc5#
    • 1...Qh3
      • 2.Qxc5#
    • 1...Qe4
      • 2.Qxc5#
    • 1...Qe6
      • 2.Qxc5#
    • 1...Qe8
      • 2.Qxc5#
    • 1...Ra2
      • 2.Qd8#
    • 1...Rb2
      • 2.Qd8#
    • 1...Rc2
      • 2.Qd8#
    • 1...Re2
      • 2.Qd8#
    • 1...Rf2
      • 2.Qd8#
    • 1...Rg2
      • 2.Qd8#
    • 1...Rh2
      • 2.Qd8#
    • 1...Rd4
      • 2.Qxc5#
    • 1...Rd8
      • 2.Qxd8#
    • 1...Bd5
      • 2.Qd8#
  • Tries
    • 1.Sb2?
      • threat
        • 2.Rb5#
      • 1...Rxb2
        • 2.Qd8#
      • 1...Qe7
        • 2.Ra1#
      • 1...Rd7!
    • 1.Sc3?
      • threat
        • 2.Rb5#
      • 1...Qxc3
        • 2.Qxc5#
      • 1...Rd7
        • 2.Ra1#
      • 1...Qe7!
    • 1.Sxc5?
      • threat
        • 2.Rb5#
      • 1...Qxc5+
        • 2.Qxc5#
      • 1...Qe7
        • 2.Sb3#
      • 1...Rd7!
  • Keys
    • 1.Ra1!
      • threat
        • 2.Rb5#
      • 1...Rd7
        • 2.Sc3#
      • 1...Qa3
        • 2.Qxc5#
      • 1...Qe7
        • 2.Sb2#
      • 1...Ra2
        • 2.Qd8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 21
  • Sets
    • Q(b);N_GUARD::QAR2(D),XP(e)
    • Q(b);N_GUARD,SBLOCK::QAR2(D),XP(e)
    • R(a);N_GUARD::QAB(D)
    • R(a);S_CUTQ(b)::QAR2(D),XP(e)
    • R(a);N_GUARD::QAB(D),XR(a)
    • B(f);N_SPINP(e),S_CUTR(a)::QAB(D)
  • Tries
    • Try
      • S(B);
      • Threat
        • R1(H)
      • Vars
        • R(a);N_GUARD,XS(B)::QAB(D)
        • Q(b);N_GUARD,P_PINR(H)::R(A)
      • Refutation
        • R(a);P_PINR(H)
    • Try
      • S(B);
      • Threat
        • R1(H)
      • Vars
        • Q(b);N_GUARD,XS(B)::QAR2(D),XP(e)
        • R(a);N_GUARD,P_PINR(H)::R(A)
      • Refutation
        • Q(b);P_PINR(H)
    • Try
      • S(B);P_SPINS(B),XP(e)
      • Threat
        • R1(H)
      • Vars
        • Q(b);CHECK,OGATE,P_SPINQ(b),XS(B)::QAR2(D),XQ(b)
        • Q(b);N_PINS(B),P_PINR(H)::QAR(D)+S(B),DCHECK
      • Refutation
        • R(a);P_PINR(H)
  • Actual
    • R(A);
    • Threat
      • R1(H)
    • Vars
      • R(a);N_GUARD,P_PINR(H)::R(A)+S(B)
      • Q(b);N_GUARD::QAR2(D),XP(e)
      • Q(b);N_GUARD,P_PINR(H)::R(A)+S(B)
      • R(a);N_GUARD::QAB(D)
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