MESON Chess Problem Database

Problem Display
PID: 246461 (nQ3B1r/3RNNpp/B1p5/p1kq3R/2b1p2P/PPp3P1/2n1P2K/8 w - - 0 1)

Segers, Marcel

Europe Echecs, 1990

nQ3B1r/3RNNpp/B1p5/p1kq3R/2b1p2P/PPp3P1/2n1P2K/8

#2

13 + 12

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Sf5#
    • 1...Qe5
      • 2.Sg8#
    • 1...Qf5
      • 2.Sg8#
    • 1...Qg5
      • 2.Sg8#
    • 1...Qxh5
      • 2.Sg8#
    • 1...Sd4
      • 2.Sg8#
    • 1...Sc7
      • 2.Qa7#
  • Tries
    • 1.Sxd5+?
      • 1...Kd4
        • 2.Qe5#
      • 1...Rxf8!
    • 1.Sxc6+?
      • 1...Kxc6
        • 2.Qb7#
      • 1...Rxf8!
    • 1.Sd8?
      • threat
        • 2.Se6#
      • 1...Kd4
        • 2.Sf5#
      • 1...Qxh5
        • 2.Sg8#
      • 1...Qe5
        • 2.Sg8#
      • 1...Qf5
        • 2.Sg8#
      • 1...Qg5
        • 2.Sg8#
      • 1...Sd4
        • 2.Sg8#
      • 1...Sc7
        • 2.Qa7#
      • 1...g5!
    • 1.Qd6+?
      • 1...Kd4
        • 2.Sf5#
      • 1...Kb6!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Se6#
      • 1...Kd4
        • 2.Sf5#
      • 1...Qxg5
        • 2.Sg8#
      • 1...Qe6
        • 2.Sxe4#
        • 2.Sxe6#
      • 1...Qe5
        • 2.Sxe4#
      • 1...Qf5
        • 2.Sxe4#
      • 1...Sd4
        • 2.Sxe4#
      • 1...Sc7
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • K(f);S_FLIGHT::S(J)
    • Q(g);P_PINP(E)::B(M)+S(J)
    • Q(g);::B(M)+S(J)
    • Q(g);N_SPINQ(g),P_PINP(F),XR(G)::B(M)+S(J)
    • S(a);SBLOCK::B(M)+S(J)
    • S(k);N_GUARD::QAB(L)
  • Tries
    • Try
      • S(J);CHECK,XQ(g)
      • Vars
        • K(f);S_FLIGHT::QAB1(L)
      • Refutation
        • R(l);XB(M)
    • Try
      • S(J);CHECK,XP(h)
      • Vars
        • K(f);N_SPINQ(g),P-FLIGHT,XS(J)::QAB1(L)
      • Refutation
        • R(l);XB(M)
    • Try
      • S(K);
      • Threat
        • S(K)
      • Vars
        • K(f);S_FLIGHT::S(J)
        • Q(g);N_SPINQ(g),P_PINP(F),XR(G)::B(M)+S(J)
        • Q(g);P_PINP(E)::B(M)+S(J)
        • Q(g);::B(M)+S(J)
        • S(a);SBLOCK::B(M)+S(J)
        • S(k);N_GUARD::QAB(L)
      • Refutation
        • P(i);N_SPINQ(g)
    • Try
      • Q(L);CHECK
      • Vars
        • K(f);S_FLIGHT::S(J)
      • Refutation
        • K(f);N_SPINQ(g),P_SPINP(h),S_FLIGHT
  • Actual
    • S(K);N_PINQ(g)
    • Threat
      • S(K)
    • Vars
      • K(f);P_SPINQ(g),S_FLIGHT::S(J)
      • Q(g);N_GUARD,P_SPINQ(g),XS(K)::B(M)+S(J)
      • Q(g);P_PINP(E)::S(K),XP(d)
      • Q(g);::S(K),XP(d)
      • S(a);SBLOCK::S(K),XP(d)
      • S(k);N_GUARD::QAB(L)
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