MESON Chess Problem Database

Problem Display
PID: 266968 (5Rq1/3r4/2B2NpB/3P4/6p1/r1n1PkPp/5p1K/5Q2 w - - 0 1)

Mitrinovic, Stevan

The Problemist, 1955

5Rq1/3r4/2B2NpB/3P4/6p1/r1n1PkPp/5p1K/5Q2

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Qd1#
    • 1...Sd1
      • 2.Qxd1#
    • 1...Sa2
      • 2.Qd1#
    • 1...Se2
      • 2.Qh1#
    • 1...Sa4
      • 2.Qd1#
    • 1...Se4
      • 2.Qd1#
    • 1...Sb5
      • 2.Qd1#
    • 1...Sxd5
      • 2.Qd1#
  • Tries
    • 1.Se4+?
      • 1...Qf7
        • 2.Sd2#
      • 1...Qxf8
        • 2.Sd2#
      • 1...Rf7
        • 2.Sd2#
      • 1...Kxe4!
    • 1.Qd1+?
      • 1...Se2
        • 2.Qh1#
      • 1...Sxd1!
    • 1.d6+?
      • 1...Se4
        • 2.Bxe4#
        • 2.Qd1#
      • 1...Sd5
        • 2.Qd1#
      • 1...Qd5!
  • Keys
    • 1.Qd3!
      • threat
        • 2.e4#
      • 1...f1S+
        • 2.Qxf1#
      • 1...Qxd5
        • 2.Sxd7#
      • 1...Rxd5
        • 2.Sxg8#
      • 1...Sxd5
        • 2.Qd1#
      • 1...f1Q
        • 2.Qxf1#
      • 1...f1B
        • 2.Qxf1#
      • 1...f1R
        • 2.Qxf1#
      • 1...Sb1
        • 2.Qd1#
      • 1...Sd1
        • 2.Qxd1#
      • 1...Sa2
        • 2.Qd1#
      • 1...Se2
        • 2.Qe4#
      • 1...Sa4
        • 2.Qd1#
      • 1...Se4
        • 2.Qd1#
      • 1...Sb5
        • 2.Qd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAB(A)
    • S(c);N_GUARD::QAB(A),XS(c)
    • S(c);SBLOCK::QAB(A)
    • S(c);N_GUARD,P_SPINS(c),XP(E)::QAB(A)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • Q(i);P_SPINQ(i)::S(G)
        • Q(i);XR(I)::S(G)
        • R(h);P_SPINR(h)::S(G)
      • Refutation
        • K(d);N_SPINP(a),S_FLIGHT,XS(G)
    • Try
      • Q(A);CHECK,N_PINP(a)
      • Vars
        • S(c);P_SPINS(c),SBLOCK::QAB(A)
      • Refutation
        • S(c);XQ(A)
    • Try
      • P(E);CHECK
      • Vars
        • S(c);P_SPINS(c)::QAB(A)
      • Refutation
        • Q(i);P_SPINQ(i)
  • Actual
    • Q(A);N_PINP(a)
    • Threat
      • QAR(A)+P(C)
    • Vars
      • P(a);CHECK,OGATEB::QAR2(A),XS(a)
      • Q(i);N_GUARD,P_SPINQ(i),XP(E)::R(I)+S(G),XR(h)
      • R(h);N_GUARD,P_SPINR(h),XP(E)::R(I)+S(G),XQ(i)
      • S(c);N_GUARD,P_SPINS(c),XP(E)::QAB(A)
      • P(a);OGATEB::QAR2(A),XQ(a)
      • P(a);OGATEB::QAR2(A),XB(a)
      • P(a);OGATEB::QAR2(A),XR(a)
      • S(c);N_GUARD::QAB(A)
      • S(c);N_GUARD::QAB(A),XS(c)
      • S(c);N_GUARD,SBLOCK::QAB1(A)
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