MESON Chess Problem Database

Problem Display
PID: 275770 (8/8/8/3KN3/1P1R1R1p/1Q2p2B/n1p1p1p1/2B1k3 w - - 0 1)

Thorsson, Allan Birger

Schackvarlden, 1936

8/8/8/3KN3/1P1R1R1p/1Q2p2B/n1p1p1p1/2B1k3

#2

8 + 7

15601 Albrecht-Leiss-Degener Collection 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc1
      • 2.Qc3#
    • 1...Sc3+
      • 2.Qxc3#
    • 1...Sxb4+
      • 2.Qxb4#
  • Tries
    • 1.Bxg2?
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Sxb4+
        • 2.Qxb4#
      • 1...Sxc1
        • 2.Qc3#
      • 1...h3!
    • 1.Qxc2?
      • threat
        • 2.Sd3#
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Sxc1
        • 2.Qxc1#
        • 2.Qc3#
      • 1...Sxb4+!
    • 1.Qxe3?
      • threat
        • 2.Qg1#
        • 2.Qd2#
        • 2.Qf2#
      • 1...Sc3+
        • 2.Qxc3#
      • 1...g1Q
        • 2.Sf3#
        • 2.Qxg1#
        • 2.Qd2#
      • 1...g1S
        • 2.Rf1#
        • 2.Qxg1#
        • 2.Qd2#
        • 2.Qf2#
      • 1...g1B
        • 2.Sf3#
        • 2.Rf1#
        • 2.Qxg1#
        • 2.Qd2#
      • 1...g1R
        • 2.Sf3#
        • 2.Qxg1#
        • 2.Qd2#
        • 2.Qf2#
      • 1...Sxb4+!
  • Keys
    • 1.Bxe3!
      • 1...Sc3+
        • 2.Qxc3#
      • 1...Sxb4+
        • 2.Qxb4#
      • 1...c1Q
        • 2.Sd3#
      • 1...c1S
        • 2.Bd2#
      • 1...c1B
        • 2.Sd3#
      • 1...c1R
        • 2.Sd3#
        • 2.Bd2#
      • 1...g1Q
        • 2.Sf3#
      • 1...g1S
        • 2.Bf2#
      • 1...g1B
        • 2.Sf3#
      • 1...g1R
        • 2.Sf3#
        • 2.Bf2#
      • 1...Sc1
        • 2.Qc3#

This is a version

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(b);N_GUARD,XB(A)::QAB(B)
    • S(b);CHECK,N_GUARD::QAB(B),XS(b)
    • S(b);CHECK,OGATE,XP(D)::QAB(B),XS(b)
  • Tries
    • Try
      • B(C);XP(e)
      • Vars
        • S(b);CHECK,N_GUARD::QAB(B),XS(b)
        • S(b);CHECK,OGATE,XP(D)::QAB(B),XS(b)
        • S(b);N_GUARD,XB(A)::QAB(B)
      • Refutation
        • P(g);
    • Try
      • Q(B);XP(c)
      • Threat
        • S(H)
      • Vars
        • S(b);CHECK,N_GUARD::QAB(B),XS(b)
      • Refutation
        • S(b);CHECK,XP(D)
    • Try
      • Q(B);P_PINP(d),XP(f)
      • Threat
        • DUALS(3)
      • Vars
        • S(b);CHECK,N_GUARD::QAB(B),XS(b)
      • Refutation
        • S(b);CHECK,XP(D)
  • Actual
    • B(A);XP(f)
    • Vars
      • S(b);CHECK,N_GUARD::QAB(B),XS(b)
      • S(b);CHECK,OGATE,XP(D)::QAB(B),XS(b)
      • P(c);::S(H)
      • P(c);::B(A)
      • P(e);::S(H)
      • P(e);::B(A)
      • S(b);N_GUARD::QAB(B)
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