MESON Chess Problem Database

Problem Display
PID: 243318 (1B6/1ppB2R1/b2k2n1/5Rnr/2p2p2/7p/1r1NNK2/4Q3 w - - 0 1)

Andersson, Sven Tore

Norsk Sjakkblad, 1953

1B6/1ppB2R1/b2k2n1/5Rnr/2p2p2/7p/1r1NNK2/4Q3

#2

8 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd2
      • 2.Qxd2#
    • 1...Rb5
      • 2.Sxc4#
    • 1...Sf3
      • 2.Se4#
    • 1...Se4+
      • 2.Sxe4#
    • 1...Se6
      • 2.Se4#
    • 1...Sh7
      • 2.Se4#
  • Tries
    • 1.Sxf4?
      • threat
        • 2.Rd5#
      • 1...Rxd2+
        • 2.Qxd2#
      • 1...Sxf4
        • 2.Qe5#
        • 2.Qe7#
      • 1...Sf7
        • 2.Qe6#
      • 1...Se5
        • 2.Qxe5#
      • 1...Se7
        • 2.Qxe7#
      • 1...Rb5
        • 2.Sxc4#
      • 1...Sf3
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Sh7
        • 2.Qe6#
      • 1...Se4+!
    • 1.Qd1?
      • threat
        • 2.Sxc4#
        • 2.Se4#
      • 1...Se4+
        • 2.Sxe4#
      • 1...Rxd2
        • 2.Qxd2#
      • 1...Se5
        • 2.Se4#
      • 1...c3
        • 2.Sc4#
        • 2.Se4#
      • 1...Sf7!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Rd5#
      • 1...Rxd2+
        • 2.Qxd2#
      • 1...Se4+
        • 2.Sxe4#
      • 1...Sf7
        • 2.Qe6#
      • 1...Se5
        • 2.Qxe5#
      • 1...Se7
        • 2.Qxe7#
      • 1...Rb5
        • 2.Sxc4#
      • 1...Sf3
        • 2.Se4#
        • 2.Qe6#
      • 1...Se6
        • 2.Se4#
        • 2.Qxe6#
      • 1...Sh7
        • 2.Se4#
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • R(a);OGATE,P_PINS(C),XS(B)::QAR(A),XR(a)
    • R(a);S_CUTB(g)::S(B),XP(c)
    • S(e);N_GUARD::S(B)
    • S(e);CHECK,N_GUARD::S(B),XS(e)
  • Tries
    • Try
      • S(C);P_SPINS(B),XP(d)
      • Threat
        • R1(E)
      • Vars
        • R(a);CHECK,OGATE,XS(B)::QAR(A),XR(a)
        • S(e);N_GUARD::QAR1(A)
        • S(i);N_GUARD::QAB1(A),XS(i)
        • R(a);N_PINS(B)::S(B),XP(c)
        • S(e);N_GUARD::QAR1(A),XS(e)
      • Refutation
        • S(e);CHECK
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(e);CHECK::QAR(A)+S(B),DCHECK,XS(e)
        • R(a);OGATE,P_PINS(C),P_SPINR(a),XS(B)::QAR(A),XR(a)
        • S(i);::QAR(A)+S(B),DCHECK
      • Refutation
        • S(e);
  • Actual
    • S(C);P_SPINS(B)
    • Threat
      • R1(E)
    • Vars
      • R(a);CHECK,OGATE,XS(B)::QAR(A),XR(a)
      • S(e);CHECK,N_GUARD::S(C),XS(e)
      • S(e);N_GUARD::QAR1(A)
      • S(i);N_GUARD::QAB1(A),XS(i)
      • R(a);N_PINS(B)::S(B),XP(c)
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