MESON Chess Problem Database

Problem Display
PID: 201635 (4N3/8/2p5/R1nkp3/B5Q1/2B2p2/bNPn1P2/2bRK3 w - - 0 1)

Rietveld, Johannes Jacob

Brisbane Courier, 1922

4N3/8/2p5/R1nkp3/B5Q1/2B2p2/bNPn1P2/2bRK3

#2

10 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bxb2
      • 2.Rxd2#
    • 1...Bb1
      • 2.Bb3#
      • 2.Qc4#
    • 1...Bb3
      • 2.Bxb3#
    • 1...Bc4
      • 2.Qxc4#
    • 1...e4
      • 2.Qf5#
      • 2.Qd7#
      • 2.Qg8#
  • Tries
    • 1.Sd3?
      • threat
        • 2.Sb4#
        • 2.Rxc5#
      • 1...Se4
        • 2.Qg8#
      • 1...e4
        • 2.Rxc5#
        • 2.Qg8#
      • 1...Sb3
        • 2.Sb4#
      • 1...Ba3!
    • 1.Sc4?
      • threat
        • 2.Se3#
        • 2.Sb6#
        • 2.Sf6#
        • 2.Sc7#
      • 1...e4
        • 2.Se3#
        • 2.Sb6#
        • 2.Qg8#
      • 1...Bxc4!
    • 1.Bxd2?
      • threat
        • 2.Bxc1#
      • 1...Bxd2+
        • 2.Rxd2#
      • 1...Bxb2
        • 2.Bc3#
      • 1...Bc4
        • 2.Qxc4#
      • 1...e4!
    • 1.Rb5?
      • 1...Bxb2
        • 2.Rxd2#
      • 1...Bb1
        • 2.Bb3#
        • 2.Qc4#
      • 1...Bb3
        • 2.Bxb3#
      • 1...Bc4
        • 2.Qxc4#
      • 1...e4
        • 2.Qf5#
        • 2.Qd7#
        • 2.Qg8#
      • 1...cxb5!
    • 1.Qxf3+?
      • 1...e4
        • 2.Qf5#
        • 2.Qf7#
      • 1...Ke6!
    • 1.Qe6+?
      • 1...Ke4
        • 2.Qxe5#
      • 1...Kxe6!
  • Keys
    • 1.Bd4!
      • threat
        • 2.Rxc5#
      • 1...exd4
        • 2.Qf5#
      • 1...e4
        • 2.Qd7#
      • 1...Sb3
        • 2.c4#
      • 1...Se4
        • 2.Qg8#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • B(a);N_GUARD,XS(C)::R(A),XS(c)
    • B(b);N_GUARD::B(G),XB(b)
    • B(b);N_GUARD::QAB1(H),XB(b)
  • Tries
    • Try
      • S(C);N_PINS(c),P_PINS(e)
      • Threat
        • DUALS(2)
      • Vars
        • S(c);SBLOCK::QAB(H)
        • S(c);::R(A)+S(C),DCHECK
      • Refutation
        • B(a);
    • Try
      • S(C);
      • Threat
        • DUALS(4)
      • Refutation
        • B(b);XS(C)
    • Try
      • B(F);P_PINS(e),XS(c)
      • Threat
        • R(A)+B(F),XB(a)
      • Vars
        • B(a);CHECK,OGATE,P_SPINB(a),XB(F)::R(A),XB(a)
        • B(a);N_GUARD,XS(C)::R(A)+B(F)
        • B(b);N_GUARD::QAB1(H),XB(b)
      • Refutation
        • P(g);
    • Try
      • R(I);
      • Vars
        • B(a);N_GUARD,XS(C)::R(A),XS(c)
        • B(b);N_GUARD::B(G),XB(b)
        • B(b);N_GUARD::QAB1(H),XB(b)
      • Refutation
        • P(h);XR(I)
    • Try
      • Q(H);CHECK,XP(d)
      • Refutation
        • K(f);N_SPINS(c),S_FLIGHT
    • Try
      • Q(H);CHECK
      • Vars
        • K(f);N_SPINS(c),P_SPINP(g),S_FLIGHT::QAR1(H),XP(g)
      • Refutation
        • K(f);N_SPINS(c),S_FLIGHT,XQ(H)
  • Actual
    • B(F);N_PINS(c),P_PINS(e)
    • Threat
      • R1(I),XS(e)
    • Vars
      • P(g);OGATEB,SBLOCK,XB(F)::QAR2(H)
      • P(g);SBLOCK::QAR2(H)
      • S(c);N_GUARD,S_CUTB(b)::P(D)
      • S(c);SBLOCK::QAB(H)
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