MESON Chess Problem Database

Problem Display
PID: 22135 (8/5Kn1/4P1p1/B1pPQ3/B2qb3/p2P2p1/rk3N1R/brN4R w - - 0 1)

Hartong, Jan

2nd Place, Tijdschrift vd NSB, 1924

8/5Kn1/4P1p1/B1pPQ3/B2qb3/p2P2p1/rk3N1R/brN4R

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qc3
      • 2.Bxc3#
      • 2.Qxc3#
    • 1...Bg2
      • 2.Qe2#
    • 1...Bxd3
      • 2.Scxd3#
      • 2.Sfxd3#
    • 1...Bxd5
      • 2.Qe2#
    • 1...Bf5
      • 2.Qe2#
    • 1...gxf2
      • 2.Rxf2#
  • Tries
    • 1.Sxe4+?
      • 1...g2
        • 2.Rxg2#
      • 1...gxh2!
    • 1.Qg5?
      • threat
        • 2.Sd1#
        • 2.Qd2#
      • 1...Qxf2+
        • 2.Qf6#
      • 1...Qf6+
        • 2.Qxf6#
      • 1...Qxd3
        • 2.Sd1#
        • 2.Sfxd3#
      • 1...Qxa4
        • 2.Sd1#
      • 1...Rxc1
        • 2.Qxc1#
      • 1...Bxd3
        • 2.Sd1#
        • 2.Sfxd3#
      • 1...gxf2
        • 2.Qd2#
      • 1...Qb4
        • 2.Sd1#
      • 1...Qc3
        • 2.Sd1#
      • 1...Qc4
        • 2.Sd1#
      • 1...Qe3!
    • 1.dxe4?
      • threat
        • 2.Scd3#
        • 2.Sfd3#
      • 1...gxf2
        • 2.Sd3#
        • 2.Rxf2#
      • 1...c4
        • 2.Sfd3#
      • 1...Rxc1!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Sd1#
        • 2.Qd2#
      • 1...Qf6+
        • 2.Qxf6#
      • 1...Qxf2
        • 2.Qf6#
      • 1...Qxd3
        • 2.Sd1#
        • 2.Sfxd3#
      • 1...Qxa4
        • 2.Sd1#
      • 1...Rxc1
        • 2.Qxc1#
      • 1...Bxd3
        • 2.Sd1#
        • 2.Sfxd3#
      • 1...gxf2
        • 2.Qd2#
      • 1...Qb4
        • 2.Sd1#
      • 1...Qc3
        • 2.Sd1#
      • 1...Qe3
        • 2.Qb8#
      • 1...Qc4
        • 2.Sd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 3
  • Sets
    • B(h);OGATE::QAR(I)
    • B(h);OGATE,P_PINP(J),XP(H)::QAR(I)
    • P(f);OGATE,P_SPINP(f),XS(C)::R(D),XP(f)
  • Tries
    • Try
      • S(C);CHECK,XB(h)
      • Vars
        • P(f);P_SPINP(f)::R(D),XP(f)
      • Refutation
        • P(f);XR(D)
    • Try
      • Q(I);N_PINQ(g)
      • Threat
        • DUALS(2)
      • Vars
        • Q(g);CHECK,OGATEB,P_SPINQ(g),XS(C)::QAB(I)
        • Q(g);CHECK,OGATEB::QAB(I),XQ(g)
        • Q(g);XB(F)::R(D)+S(C),DCHECK
        • R(b);OGATE,XS(A)::QAB1(I),XR(b)
        • P(f);P_SPINP(f),XS(C)::QAR2(I)
        • Q(g);::R(D)+S(C),DCHECK
      • Refutation
        • Q(g);
    • Try
      • P(E);XB(h)
      • Threat
        • DUALS(2)
      • Vars
        • P(i);::R(D)+S(C),DCHECK
      • Refutation
        • R(b);XS(A)
  • Actual
    • Q(I);N_PINQ(g)
    • Threat
      • DUALS(2)
    • Vars
      • Q(g);CHECK,OGATEB::QAB(I),XQ(g)
      • Q(g);OGATEB,P_PINQ(I),P_SPINQ(g),XS(C)::QAB(I)
      • Q(g);XB(F)::R(D)+S(C),DCHECK
      • R(b);OGATE,XS(A)::QAB1(I),XR(b)
      • P(f);P_SPINP(f),XS(C)::QAR2(I)
      • Q(g);::R(D)+S(C),DCHECK
      • Q(g);N_GUARD::QAR(I)
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