MESON Chess Problem Database

Problem Display
PID: 239593 (3NR3/b2Rr1n1/4rPP1/2B1k1K1/4p1pp/1p4q1/4N2Q/1B5b w - - 0 1)

Maleika, Gerhard

Die Schwalbe, 2002

3NR3/b2Rr1n1/4rPP1/2B1k1K1/4p1pp/1p4q1/4N2Q/1B5b

#2

10 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4+
      • 2.Qxf4#
    • 1...Rb6
      • 2.Bd4#
    • 1...Rf7
      • 2.Sc6#
      • 2.Sxf7#
    • 1...Rxe8
      • 2.Sf7#
    • 1...Bb8
      • 2.Bd4#
    • 1...h3
      • 2.Qxg3#
  • Tries
    • 1.Rexe7?
      • threat
        • 2.Sc6#
        • 2.Sf7#
      • 1...Qf4+
        • 2.Qxf4#
      • 1...e3
        • 2.Sf7#
      • 1...Rxe7!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Rd5#
      • 1...Qxf4+
        • 2.Qxf4#
      • 1...Rxd7
        • 2.Sc6#
      • 1...Qd3
        • 2.Sxd3#
      • 1...Rd6
        • 2.Sf7#
      • 1...e3
        • 2.Qb2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • Q(c);CHECK,OGATE::QAB1(C),XQ(c)
    • R(h);P_SPINR(j),S_CUTB(i)::B(D)
    • R(j);N_GUARD,XR(J)::S(I)
    • B(i);N_GUARD::B(D)
    • P(f);N_GUARD::QAB(C),XQ(c)
  • Tries
    • Try
      • R(J);P_PINR(h),XR(j)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK,OGATE::QAB1(C),XQ(c)
        • P(d);::S(I)
      • Refutation
        • R(h);N_SPINR(h),XR(J)
  • Actual
    • S(B);N_PINQ(c)
    • Threat
      • R1(H)
    • Vars
      • Q(c);CHECK,OGATE,P_SPINQ(c),XS(B)::QAB1(C),XQ(c)
      • R(j);P_SPINR(h),XR(H)::S(I)
      • Q(c);::QAB(C)+S(B),DCHECK,XQ(c)
      • R(h);P_SPINR(j)::S(I)
      • P(d);S_CUTQ(c)::QAB(C)
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