MESON Chess Problem Database

Problem Display
PID: 11110 (1r1r1nb1/2PnP1P1/R1BNk1p1/q4N2/ppP4b/7Q/1B6/3K1R2 w - - 0 1)

Thorsson, Allan Birger

3rd Prize, Olympic Ty., 1936

1r1r1nb1/2PnP1P1/R1BNk1p1/q4N2/ppP4b/7Q/1B6/3K1R2

#2

12 + 11

3098 FIDE Album (1914-1944) (I) 1971

SOLUTION

  • SOUND
  • Sets
    • 1...Qb6
      • 2.Bd5#
    • 1...Qxc7
      • 2.Bd5#
    • 1...Qd5+
      • 2.Bxd5#
      • 2.cxd5#
    • 1...Qxa6
      • 2.Bd5#
    • 1...Rb6
      • 2.cxd8S#
  • Tries
    • 1.cxd8S+?
      • 1...Qxd8
        • 2.Bd5#
      • 1...Rxd8!
    • 1.e8Q+?
      • 1...Be7
        • 2.Qxe7#
      • 1...Rxe8!
    • 1.e8R+?
      • 1...Be7
        • 2.Rxe7#
      • 1...Rxe8!
  • Keys
    • 1.Sc8!
      • threat
        • 2.Bd5#
      • 1...Qd5+
        • 2.Bxd5#
      • 1...Sc5+
        • 2.Sfd6#
      • 1...Se5+
        • 2.Sd4#
      • 1...Sb6+
        • 2.cxd8S#
      • 1...Sf6+
        • 2.exd8S#
      • 1...Kf7
        • 2.Sfd6#
      • 1...Rb6
        • 2.cxd8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 3
  • Sets
    • Q(d);N_GUARD::B(H)
    • Q(d);N_GUARD,XP(J)::B(H)
    • Q(d);N_GUARD,XR(G)::B(H)
    • R(h);N_GUARD,S_CUTQ(d)::PXR(i)=S
  • Tries
    • Try
      • P(J);CHECK,XR(i)
      • Vars
        • Q(d);XS(J)::B(H)
      • Refutation
        • R(h);XS(J)
    • Try
      • P(K);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR1(K),XB(c)
      • Refutation
        • R(i);XQ(K)
    • Try
      • P(K);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::R1(K),XB(c)
      • Refutation
        • R(i);XR(K)
  • Actual
    • S(I);
    • Threat
      • R(G)+B(H),DCHECK
    • Vars
      • Q(d);CHECK::R(G)+B(H),DCHECK,XQ(d)
      • S(g);CHECK,S_CUTQ(d)::QAB(D)+S(F)
      • S(g);CHECK,SBLOCK::QAB(D)+S(F),DCHECK
      • S(g);CHECK,S_CUTQ(d)::PXR(i)=S
      • S(g);CHECK,S_CUTB(c)::PXR(i)=S
      • K(e);S_FLIGHT::R(B)+S(F),DCHECK
      • R(h);S_CUTQ(d)::PXR(i)=S
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