MESON Chess Problem Database

Problem Display
PID: 159943 (8/8/8/8/8/3pQ3/r7/5kNK w - - 0 1)

Andreev, Aleksandr Grigorevich

Bankovskaya gazeta, 1996

8/8/8/8/8/3pQ3/r7/5kNK

#2

3 + 3

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rf2
      • 2.Qc1#
    • 1...d2
      • 2.Qe2#
  • Tries
    • 1.Se2?
      • threat
        • 2.Sg3#
      • 1...Rxe2
        • 2.Qg1#
      • 1...dxe2
        • 2.Qg1#
      • 1...Ke1!
    • 1.Qf4+?
      • 1...Rf2
        • 2.Qc1#
      • 1...Ke1!
    • 1.Qf3+?
      • 1...Rf2
        • 2.Qd1#
      • 1...Ke1!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Qe1#
      • 1...Rh2+
        • 2.Sxh2#
      • 1...Ra1
        • 2.Sd2#
        • 2.Sh2#
      • 1...Re2
        • 2.Qg1#
      • 1...d2
        • 2.Sh2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(b);SBLOCK::QAR(C)
    • P(c);N_GUARD,S_CUTR(b)::QAB1(C)
  • Tries
    • Try
      • S(A);
      • Threat
        • S(A)
      • Vars
        • R(b);SBLOCK,XS(A)::QAR1(C)
        • P(c);SBLOCK,XS(A)::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • R(b);P_SPINR(b),SBLOCK::QAR(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • R(b);P_SPINR(b),SBLOCK::QAR2(C)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(A);
    • Threat
      • QAR1(C)
    • Vars
      • R(b);CHECK,N_GUARD::S(A),XR(b)
      • R(b);SBLOCK::QAR1(C)
      • P(c);S_CUTR(b)::S(A)
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