MESON Chess Problem Database

Problem Display
PID: 206203 (2Q1N3/1p1rPp1B/pP2kBp1/Rp5p/3pP2P/3K2P1/8/8 w - - 0 1)

Biscan, Dragutin

Il Problema, 1970

2Q1N3/1p1rPp1B/pP2kBp1/Rp5p/3pP2P/3K2P1/8/8

#2

11 + 9

5454 Near Snap 2020
15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...b4
      • 2.Re5#
    • 1...g5
      • 2.Bf5#
  • Tries
    • 1.Kc2?
      • 1...b4
        • 2.Re5#
      • 1...g5
        • 2.Bf5#
      • 1...d3+!
    • 1.Kd2?
      • 1...b4
        • 2.Re5#
      • 1...g5
        • 2.Bf5#
      • 1...d3!
    • 1.Ke2?
      • 1...b4
        • 2.Re5#
      • 1...g5
        • 2.Bf5#
      • 1...d3+!
    • 1.Sg7+?
      • 1...Kd6
        • 2.e8S#
      • 1...Kxf6!
    • 1.Bg8?
      • 1...b4
        • 2.Re5#
      • 1...g5!
    • 1.Qc4+?
      • 1...Rd5
        • 2.Qxd5#
      • 1...bxc4+!
    • 1.Qc5?
      • threat
        • 2.Qe5#
      • 1...Rxe7
        • 2.Qd6#
        • 2.Qxe7#
        • 2.Qd5#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Rd6
        • 2.Qxd6#
      • 1...Rc7
        • 2.Qd6#
        • 2.Qd5#
      • 1...Rd8!
    • 1.Qc6+?
      • 1...Rd6
        • 2.Qxd6#
      • 1...bxc6!
    • 1.Qd8?
      • 1...Rxe7
        • 2.Qxe7#
        • 2.Qd5#
        • 2.Qd6#
      • 1...b4
        • 2.Re5#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Rd6
        • 2.Qxd6#
      • 1...Rc7
        • 2.Qd5#
        • 2.Qd6#
      • 1...g5
        • 2.Bf5#
      • 1...Rxd8!
    • 1.g4?
      • 1...b4
        • 2.Re5#
      • 1...g5
        • 2.Bf5#
      • 1...hxg4!
  • Keys
    • 1.e5!
      • 1...Kd5
        • 2.Qc4#
      • 1...Kf5
        • 2.Qxd7#
      • 1...b4
        • 2.Sg7#
      • 1...g5
        • 2.Sc7#

Anticipated by 17535(1947)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATE::R1(E)
    • P(f);OGATE::B(I)
  • Tries
    • Try
      • K(A);S_FLIGHT
      • Vars
        • P(b);OGATE::R1(E)
        • P(f);OGATE::B(I)
      • Refutation
        • P(a);CHECK
    • Try
      • K(A);P-FLIGHT
      • Vars
        • P(b);OGATE::R1(E)
        • P(f);OGATE::B(I)
      • Refutation
        • P(a);
    • Try
      • K(A);S_FLIGHT
      • Vars
        • P(b);OGATE::R1(E)
        • P(f);OGATE::B(I)
      • Refutation
        • P(a);CHECK
    • Try
      • S(K);CHECK
      • Vars
        • K(e);N_SPINR(h),P-FLIGHT::P=S
      • Refutation
        • K(e);N_SPINR(h),P-FLIGHT,XB(G)
    • Try
      • B(I);P_PINP(i)
      • Vars
        • P(b);OGATE::R1(E)
      • Refutation
        • P(f);
    • Try
      • Q(J);CHECK,N_PINR(h)
      • Vars
        • R(h);N_GUARD,P_SPINR(h)::QAB1(J),XR(h)
      • Refutation
        • P(b);CHECK,XQ(J)
    • Try
      • Q(J);N_PINR(h)
      • Threat
        • QAR1(J)
      • Vars
        • R(h);N_GUARD::QAB1(J),XR(h)
        • R(h);N_GUARD::QAR1(J),XR(h)
      • Refutation
        • R(h);
    • Try
      • Q(J);CHECK,N_PINR(h)
      • Vars
        • R(h);N_GUARD,P_SPINR(h)::QAR1(J),XR(h)
      • Refutation
        • P(g);XQ(J)
    • Try
      • Q(J);N_PINR(h)
      • Vars
        • P(b);OGATE::R1(E)
        • R(h);OGATE::QAB1(J),XR(h)
        • R(h);OGATE::QAR1(J),XR(h)
        • P(f);OGATE::B(I)
      • Refutation
        • R(h);XQ(J)
    • Try
      • P(B);
      • Vars
        • P(b);OGATE::R1(E)
        • P(f);OGATE::B(I)
      • Refutation
        • P(c);XP(B)
  • Actual
    • P(C);
    • Vars
      • K(e);N_SPINR(h),P_SPINP(b),S_FLIGHT::QAB1(J)
      • K(e);P_SPINP(f),S_FLIGHT::QAB(J),XR(h)
      • P(b);::S(K)
      • P(f);::S(K)
HTML5 logo

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).