MESON Chess Problem Database

Problem Display
PID: 241382 (1n2r3/2p2p1q/b1pk1P1p/2N1R3/1bPKPPQ1/B1p5/2P5/8 w - - 0 1)

Hjelle, David

Norsk Sjakkblad, 1937

1n2r3/2p2p1q/b1pk1P1p/2N1R3/1bPKPPQ1/B1p5/2P5/8

#2

10 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4+
      • 2.Sxe4#
    • 1...Rxe5
      • 2.fxe5#
    • 1...Ba5
      • 2.Sb7#
    • 1...Bxc5+
      • 2.Bxc5#
    • 1...Bxc4
      • 2.Sb7#
    • 1...Bb5
      • 2.Sb7#
    • 1...Bb7
      • 2.Sxb7#
    • 1...Sd7
      • 2.Qxd7#
  • Tries
    • 1.Ke3?
      • threat
        • 2.Qd1#
      • 1...Qxe4+
        • 2.Sxe4#
      • 1...Bxc5+
        • 2.Bxc5#
      • 1...Bxc4
        • 2.Sb7#
      • 1...Rxe5!
    • 1.Re6+?
      • 1...fxe6
        • 2.e5#
      • 1...Rxe6!
    • 1.Rxe8?
      • threat
        • 2.e5#
      • 1...Qxe4+
        • 2.Sxe4#
      • 1...Bxc5+
        • 2.Bxc5#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Qf5!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Ke3#
      • 1...Qxe4+
        • 2.Kxe4#
      • 1...Bxc5+
        • 2.Kxc3#
      • 1...Rxe5
        • 2.fxe5#
      • 1...Bxc4
        • 2.Kxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 4
  • Sets
    • Q(i);CHECK,XP(E)::S(H),XQ(i)
    • R(k);OGATE,XR(I)::P(F),XR(k)
    • B(b);::B(B)+S(H),DCHECK
    • B(b);CHECK,OGATE,P_SPINB(b),XS(H)::B(B),XB(b)
    • B(c);N_GUARD,XP(C)::S(H)
    • B(c);N_GUARD::S(H)
    • B(c);N_GUARD::S(H),XB(c)
    • S(j);N_GUARD::QAR1(G),XS(j)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Threat
        • QAR(G)
      • Vars
        • Q(i);CHECK,XP(E)::S(H),XQ(i)
        • B(b);CHECK,OGATE,P_SPINB(b),XS(H)::B(B),XB(b)
        • B(c);N_GUARD,XP(C)::S(H)
      • Refutation
        • R(k);P_PINP(E),XR(I)
    • Try
      • R(I);CHECK
      • Vars
        • P(h);XR(I)::P(E)
      • Refutation
        • R(k);XR(I)
    • Try
      • R(I);XR(k)
      • Threat
        • P(E)
      • Vars
        • Q(i);CHECK,XP(E)::S(H),XQ(i)
        • B(b);CHECK,OGATE,P_SPINB(b),XS(H)::B(B),XB(b)
        • S(j);N_GUARD::QAR1(G),XS(j)
      • Refutation
        • Q(i);
  • Actual
    • Q(G);
    • Threat
      • QAR(G)+K(D)
    • Vars
      • Q(i);CHECK,XP(E)::QAR(G)+K(D),XQ(i)
      • B(b);CHECK,P_SPINB(b),XS(H)::QAR(G)+K(D),XP(a)
      • R(k);OGATE,XR(I)::P(F),XR(k)
      • B(c);XP(C)::QAR(G)+K(D),XB(c)
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